Conduction is a process through which energy is transferred from the branding iron to the handle.
When two objects with different surface temperatures come into close touch with one another, conduction happens. Up until they reach thermal equilibrium, or the point at which they are at the same temperature, the heat energy moves from the hotter to the cooler object.
The metal tip of the branding iron, which makes contact with the branded surface, becomes extremely hot when it is placed in the fire because of the high fire temperature.
Hence, conduction is a process through which energy is transferred from the branding iron to the handle.
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How can a simple fixed pulley make a job easier? (1 point)
O by decreasing the distance that the force needs to be applied
by changing the direction at which the force needs to be applied
O by decreasing the work done
O by decreasing the force required to lift the object
Answer:
A fixed pulley changes the direction of the force you exert by pulling, so you can pull down to move an object up.
Explanation:
By decreasing the work done. A simple fixed pulley reduces the amount of work needed to lift an object by changing the direction of the force applied, so the same force can be used to lift the object with less effort.
What is force?Force is the action of one object upon another. It is a vector quantity, meaning it has both a magnitude and a direction. Forces can cause an object to accelerate, decelerate, or remain in a constant velocity. Examples of forces include gravity, friction, tension, and electric and magnetic forces. The study of forces and their effects is known as mechanics. Forces can act in pairs, such as the forces between two interacting objects, or individually, such as the force of gravity acting on an object. In physics, the force is measured in Newtons (N), and the magnitude of a force is measured in joules (J). Forces can cause changes in the shape or motion of objects.
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A magazine rack has a center of gravity 16 cm above the floor, as shown in the figure below (Figure 1). Through what maximum angle, in degrees, can the rack be tilted without falling over?
The rack can be tilted to a maximum of 8.880 before falling over.
What is acceleration due to gravity ?
Gravitational acceleration is the acceleration experienced by an object due to gravity. Its SI unit is m/s2. It is vector magnitude because it has both magnitude and direction. The standard value of g on the surface of the earth at 0m above sea level is 9.8m/s2. Suppose an object [test mass (m)] is moved from a height "h" above the ground [source mass (M)], and as it approaches the ground it begins to move downwards, increasing its velocity. We know that the velocity of an object changes only under the action of a force. In this case the force is provided by gravity.
Under the action of gravity, the object begins to accelerate towards the center of the earth. The center of the Earth is at a distance "r" from the test mass. Then ma = GMm/r2 (applies the equivalence principle)
⇒ a = GM/r2 . . . . . . (1)
The above acceleration is due to the earth's gravitational pull, so we call it the gravitational acceleration and it does not depend on the test mass. The value near the ground is 9.8 ms-2. Therefore the acceleration due to gravity (g) is given by = GM/r2.
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The bathroom is 100 meters away, and you can only walk at 2 m/s. How much time will it take you to reach the bathroom?
A: 200 sec
B: 50 sec
C: 100 sec
D: 20 sec
Answer:
50 seconds.
Explanation:
See attached photo.
This question can be solved by simply setting up cross-multiplication and understanding metrics.
Given Information• The bathroom is 100 meters away.
• One can only walk at 2 meters per second.
Set up the Cross-MultiplicationTo cross-multiply fractions, we multiply the numerator of the first fraction with the denominator of the second fraction and the numerator of the second fraction with the denominator of the first fraction.• So essentially we can ask the question like this:
If it takes one second to walk 2 meters, how many seconds will it take to walk 100 meters?The inequality can be set up like this:[tex]\frac{2meters}{100 seconds} = \frac{1 second}{x seconds}[/tex] 2 meters equals 1 second and 100 meters will be equal to x seconds because that's what we want to find. We will use an x to represent the unknown amount of seconds:Multiply the meters and seconds on each side.[tex](2 meters)(x seconds) = (100 meters) (1 second)[/tex]Because the unknown amount of seconds is multiplied by 2 meters on the left-hand side, divide both sides by 2 meters.[tex]\frac{(2 meters)(xseconds)}{(2 meters)} = \frac{(100 meters)(1seconds)}{(2 meters)}[/tex]Once 100 meters are divided by 2 meters, we are left with 50 seconds.Please see the image attached and let me know if this helped!!!
The weather conditions on Mars today are much different than they were in the distant past.
True or False
ketch a PV diagram and find the work done by the gas during the following stages.
(a) A gas is expanded from a volume of 1.0 L to 3.0 L at a constant pressure of 3.0 atm.
(b) The gas is then cooled at constant volume until the pressure falls to 2.0 atm.
(c) The gas is then compressed at a constant pressure of 2.0 atm from a volume of 3.0 L to 1.0 L. Note: Be careful of signs.
(d) The gas is heated until its pressure increases from 2.0 atm to 3.0 atm at a constant volume.
(e) Find the net work done during the complete cycle.
(a) The work done by the gas during this stage can be calculated using the equation: W = P * (Vf - Vi) = 3.0 atm * (3.0 L - 1.0 L) = 6.0 L-atm.
(b) The work done by the gas during this stage is zero, since the gas is cooling at constant volume.
(c) The work done by the gas during this stage can be calculated using the equation: W = P * (Vf - Vi) = 2.0 atm * (1.0 L - 3.0 L) = -4.0 L-atm. Note the negative sign indicates work is done on the gas.
(d) The work done by the gas during this stage can be calculated using the equation: W = P * (Vf - Vi) = 3.0 atm * (3.0 L - 3.0 L) = 0 L-atm.
(e) The net work done during the complete cycle can be found by adding up the work done during each stage: Wnet = 6.0 L-atm + 0 L-atm + (-4.0 L-atm) + 0 L-atm = 2.0 L-atm.
What is a constant pressure cycle?A constant pressure cycle is a thermodynamic process where the pressure remains constant while the volume and temperature of the gas change. In such a cycle, the work done by the gas is equal to the change in its volume multiplied by the constant pressure. The PV diagram of a constant pressure cycle is a horizontal line at the constant pressure value, because the pressure does not change. The most common example of a constant pressure cycle is the Otto cycle used in internal combustion engines.
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What is the direction of the magnetic force that this solenoid exerts on the bar magnet?
O Upward
O Downard
O To the right away from the solenoid
O To the left, toward the solenoid.
Correct option is D, the direction of the magnetic force that this solenoid exerts on the bar magnet To the left, toward the solenoid.
We are aware that like poles repel one another and that opposing poles attract one another. Therefore, the bar magnet will be drawn to the solenoid. Therefore, the solenoid's left side must be receiving the force.
We are aware that like poles repel one another and that opposing poles attract one another. Therefore, the bar magnet will be drawn to the solenoid. Therefore, the solenoid's left side must be receiving the force.
What does magnetic force mean?One of the four fundamental forces of nature, the electromagnetic force, results in the magnetic force, which is brought about by the motion of charges. When two charge-containing objects move in the same direction, a magnetic attraction pulls them together. A compass, a motor, the magnets that hold items in refrigerators, railroad tracks, and modern roller coasters are examples of devices that use magnetic force. A magnetic field is created by all moving charges, and the charges that move across its areas,
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A valid scientific hypothesis
A. is proven wrong
B. is proven right
C. can be proven right or wrong right
D. makes common sense
E. is not intuitive
C. can be proven right or wrong
A scientific hypothesis is a proposed explanation for an observation or phenomenon. A valid scientific hypothesis must be testable and falsifiable, meaning that it can be proven right or wrong through the collection and analysis of data. A scientific hypothesis that cannot be tested or disproven is not considered a valid scientific hypothesis. Additionally, a scientific hypothesis should not be based on common sense or intuition alone, as these can be misleading and not always accurate. Rather, it should be supported by evidence and logical reasoning.
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The element shown in Figure P1.24 I has v (t) = 10 V and i (t) = 2e A. Compute the power for the circuit
element. Find the energy transferred between t= 0 and 1= [infinity] Is this energy absorbed by the elementor
supplied by it
This question focuses on the element shown in Figure P1.24 I, with a voltage of 10 V and current of 2e A.
The goal is to calculate the power of the circuit element and the total energy transferred between t= 0 and t= [infinity]. To determine if this energy is absorbed or supplied by the element, calculations must be done. First, the power of the circuit element can be calculated by multiplying the voltage and current together.
This yields a power of 20e W. Next, the energy transferred between t= 0 and t= [infinity] can be found by integrating the power over that time interval. This yields an energy of 20e Joules. Finally, to determine if the energy is absorbed or supplied by the element, the sign of the power must be checked. In this case, the power is positive, so the element is supplying the energy.
A fast-food hamburger (with cheese and bacon) contains 1000 Calories.
Part A
What is the burger's energy in joules? Please convert answer to kj in two significant figures.
Part B
If all this energy is used to lift a 20 {\rm kg} mass, how high can it be lifted?
Please express your answer in two significant figures in km
So, we compiled a list of every fast-food burger with more than 1,000 calories. Consider this: the majority of individuals eat 2,000 calories on average each day.
It is therefore quite simple to exceed that calorie restriction if one component of one meal has more calories than a day's worth. Because of this, we've compiled a list of the worst fast-food burgers with surprisingly high calorie counts, from the worst to the worst offenders. The lack of McDonald's burgers on this list may actually come as a surprise to you. Unexpectedly, every burger at Mickey D's has fewer than 1,000 calories. The Double Quarter-Pounder with Cheese, which has 740 calories, is the main offender.
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Optics question (Grade 10 Science)
The index of refraction of the gem is 1.54.
What is index of refraction?The index of refraction quantifies how a light beam deflects as it passes through various materials.
By dividing the speed of light at a specific wavelength in vacuum space by the speed of light in that medium, the refractive index is determined.
The speed of light in gem is = 1.95 × 10⁸ m/s
The speed of light in vacuum = 3 × 10⁸ m/s.
The index of refraction of that gem = (speed of light in vacuum/speed of light in that medium)
= (3 × 10⁸ m/s)/(1.95 × 10⁸ m/s)
= 1.54.
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How much charge must pass by a point in a wire in 10 s for the current inb the wire to be 0.50 A?
A) 5.0 C
B) 2.0 C
C) 0.050 C
D) 20 C
A) 5.0 C charge must pass by a point in a wire in 10 s for the current in the wire of 0.50 A current.
Current is the flow of electric charge per unit time. It is measured in amperes (A). The formula for current is:
I = Q / t
Where I is the current, Q is the charge, and t is the time.
In this case, the current is given as 0.50 A, and the time is given as 10 s. To find the charge that must pass by a point in a wire, we can rearrange the formula:
Q = I * t
Therefore, Q = 0.50 A * 10 s = 5.0 C
So, the charge that must pass by a point in a wire in 10 seconds for the current in the wire to be 0.50 A is 5.0 C.
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To perform this maneuver, the dancer relies on the fact that the position of her center of gravity
A. Is near the center of the torso.
B. Is determined by the positions of her arms and legs.
C. Moves in a horizontal path.
D. Is outside of her body.
option (B) is correct answer.
What is acceleration due to gravity ?
Gravitational acceleration is the acceleration experienced by an object due to gravity. Its SI unit is m/s2. It is vector magnitude because it has both magnitude and direction. The standard value of g on the surface of the earth at 0m above sea level is 9.8m/s2. Suppose an object [test mass (m)] is moved from a height "h" above the ground [source mass (M)], and as it approaches the ground it begins to move downwards, increasing its velocity. We know that the velocity of an object changes only under the action of a force. In this case the force is provided by gravity.
Under the action of gravity, the object begins to accelerate towards the center of the earth. The center of the Earth is at a distance "r" from the test mass. Then ma = GMm/r2 (applies the equivalence principle)
⇒ a = GM/r2 . . . . . . (1)
The above acceleration is due to the earth's gravitational pull, so we call it the gravitational acceleration and it does not depend on the test mass. The value near the ground is 9.8 ms-2. Therefore the acceleration due to gravity (g) is given by = GM/r2.
The dancer relies the position of center center of gravity is determined by the Positions of her arms and legs.
Hence option (B) is correct answer.
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1. An object is moving with an acceleration of 2 m/s². What will the acceleration be if
the force applied to the object is tripled? Explain.
Show work
Answer:
Vegas for a week or two and I deserve it to me right next to me right next to me.
Explanation:
no exceptions
As researchers cool a substance close to absolute zero, what happens?
-The work needed to cool it further falls to zero.
-The work needed to cool it further decreases, becoming easier.
-The work needed to cool it further increases.
-Work is done on the environment by the substance.
Answer:
Nothing can be cooled to a temperature of exactly absolute zero. The temperature of an object is a measure of the average random motion energy (kinetic energy) of its atoms. Absolute zero is the temperature at which all of an object's atoms have been brought to a dead stop relative to each other.
Explanation:
When applied to cooling, the question becomes how much work must be done and how large must the cooling reservoir be in order to cool an object to absolute zero (0 Kelvin, -273.15°C, or -459.67°F)? The physicists showed that cooling a system to absolute zero requires either an infinite amount of work or an infinite reservoir.
1. To prepare the body for the vigorous workout. 2. To allow the body to settle down and unwind. What does a well-designed kettlebell workout consist of? 1. Preparation phase: Warm up 2. Main phase: Workout 3. Final phase: Cool down What does the main phase of a workout involve?
A person’s environment can include many settings, including home, work, school, neighborhoods, recreation areas, and social events. If your environment is one in which drugs or alcohol are available and widely accepted, it can have a strong effect on your potential for abuse and addiction. Environmental factors can strongly influence addiction.
In the equation ω=ω0+αt, what does the time variable t represent? Choose the answer that is always true. Several of the statements may be true in a particular problem, but only one is always true. the moment in time at which the angular velocity equals ω0 the moment in time at which the angular velocity equals ω the time elapsed from when the angular velocity equals ω0 until the angular velocity equals ω
In the equation ω=ω0+αt, the time elapsed from when the angular velocity equals ω0 until the angular velocity equals ω.
Option C is correct.
What is angular velocity?Angular velocity is a vector quantity, expressed as the angular velocity or rotational speed of an object and the rate of change of angular displacement that specifies the axis about which the object rotates.
Why is angular velocity a vector?Angular velocity is a vector quantity and has both magnitude and direction. This direction is the same as the direction of angular displacement that defined the angular velocity.
What is angular velocity, give an example?For example, a roulette ball on a roulette wheel, a racing car on a circular track, and a Ferris wheel are examples of angular velocity. Furthermore, the angular velocity of an object is the angular displacement of the object in time.
Question is incomplete . Missing options are:
In the equation ω=ω0+αt, what does the time variable t represent? Choose the answer that is always true. Several of the statements may be true in a particular problem, but only one is always true.
A. the moment in time at which the angular velocity equals ω0
B. the moment in time at which the angular velocity equals ω
C. the time elapsed from when the angular velocity equals ω0 until the angular velocity equals ω
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A roller coaster car(m=80kg) on nitro is moving at a speed of 68 m/s as it starts going up to the top of the ride. How high is the ride’s highest point relative to this starting point?
According to the given statement 11.48 m high is the ride’s highest point relative to this starting point.
What is speed in physics and its unit?Speed is the rate of change of a distance with respect to time. Time-distance is one of its dimensions. The result is that the basic units of time and distance are added to produce the SI unit of speed. The Si system of speed is therefore the m per second (m/s).
The following data were obtained from the question:
The roller coaster weighs 1200 Kg in mass (m).
Initial velocity (u) = 15 m/s.
Final speed (v) equals 0 m/s (at highest point)
Acceleration due to gravity (g) = 9.8 m/s²
Highest point (h) =?
The roller coaster's highest point can be found as shown in the illustration below:
h = u²/2g
h = 15² / 2 × 9.8
h = 225/19.6
h = 11.48 m
Therefore, the highest point reached by the roller-coaster is 11.48 m.
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A laser produces a ray of blue light of wavelength 4.0 x 10-7m (0.000 00040m).
(a) (i) State the speed of light in a vacuum.
speed =
Answer:d
Explanation: lama lama
The speed of light in a vacuum is approximately 3× 10⁸ meters per second (m/s).
Light is a form of electromagnetic radiation that our eyes can detect. It is a fundamental phenomenon in physics and plays a crucial role in our understanding of the universe. Light consists of tiny packets of energy called photons that travel as waves. It exhibits both wave-like and particle-like properties, known as wave-particle duality.
Speed: In a vacuum, light travels at a constant speed of approximately
299,792,458 meters per second ( 3× 10⁸ m/s).
Wavelength: Light has a property called wavelength, which is the distance between two consecutive peaks (or troughs) of a light wave. Different colors of light have different wavelengths.
Frequency: The frequency of light is the number of wave cycles that pass a point in one second. It is inversely proportional to the wavelength.
Spectrum: The electromagnetic spectrum includes a wide range of electromagnetic waves, with visible light forming only a small part of it. The spectrum includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Colors: Visible light is the portion of the electromagnetic spectrum that our eyes can perceive. It consists of different colors, each corresponding to a specific range of wavelengths. These colors include red, orange, yellow, green, blue, indigo, and violet.
Reflection and Refraction: Light can bounce off surfaces (reflection) or change direction when passing through different mediums (refraction).
Interference and Diffraction: Light waves can interfere with each other, leading to patterns of constructive and destructive interference. Diffraction is the bending of light waves as they encounter obstacles or pass through narrow openings.
Polarization: Light waves can also be polarized, meaning their oscillations occur in a particular plane. Polarized sunglasses, for example, can block certain orientations of light waves.
Quantum Nature: Light exhibits both wave-like and particle-like behavior. In certain situations, it behaves as discrete packets of energy called photons.
Propagation: Light can travel through a vacuum (empty space) as well as through various materials, though its speed may change depending on the medium.
Light has a profound impact on various fields, including physics, astronomy, biology, and technology. Our understanding of light and its properties has led to the development of lasers, fiber optics, cameras, telescopes, and countless other applications that shape modern society.
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An airplane accelerates from the rest. Down a run way at 3.20 m/s2 for 32.8s until it finally lifted off the ground . Determine the distance traveled before takeoff
The plane's acceleration is 3.22 m/s2, and the travel duration is 3.28 seconds. The distance traveled before takeoff is 1720m.
How is the distance travelled prior to takeoff calculated?The kinematic equation gives us the distance travelled before to takeoff: d=v 0 t+1/2 at2, where d is the distance prior to takeoff, v 0=0 is the airplane's starting velocity, an is its acceleration, and t is the time.
A plane travels down a runway at 3. 20 m/s2 for 32. 8 seconds before ultimately taking off.
U=0 m/s is the airplane's initial speed.
The plane's acceleration is 3.22 m/s2, and the travel duration is 3.28 seconds.
Distance travelled using a formula S=ut+ 2 1 2
⇒ S=0(32.8)+0.5(3.2)(32.8) 2 =1721.3∼ 1720m
The distance traveled before takeoff is 1720m
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Which of the following is an example of the principle of electromagnetic induction?
A magnet moved through a loop of wire.
Bar magnets in the presence of a magnetic field.
The magnetic field produced by a current carrying wire.
A circuit connected to a high voltage battery.
Through a wire loop, a magnet moved.
What is magnet, exactly?Any substance that can draw iron and create a magnetic field around itself is a magnet. By the end of the 19th century, every known element and a number of compounds had been examined for magnetism and it had been found that they all exhibited some type of magnetic property.
What makes something a magnet?The earliest known users of this mineral are the ancient Greeks, who gave it the nickname "magnet" for its capacity to draw other objects made of the same substance as well as iron.
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A wrench is used to apply a torque to a bolt. Forces F1 through F6 all have the same magnitude. The point of application of force Fi (and F) is a distance d from the center of rotation of the bolt. The application points of Fı, F2, and F3 are all distance d apart, as shown. Use the convention that counter-clockwise torques are positive; clockwise torques are negative.
Part (a) Which of the labeled forces will apply the largest magnitude torque on the bolt? O All forces apply the same torque. O F1 O F4 O F3
O F2 O F5
O F6
On the bolt, F2 force will exert the most torque. Torquing a bolt involves using a wrench. There is no difference in the magnitude of forces F1 through F6.
Vector and scalar quantities both use magnitude as a common denominator. Scalar quantities are understood to be those that have only magnitude, according to their definition. Vector quantities, on the other hand, are those that have both magnitude and direction. Magnitude can be used in a number of different contexts.
where the force is being applied From the bolt's centre of rotation, Fi (and F) are separated by a distance of d. Moment of force equals torque (Rotational domain equivalent of Force)
t1 = (d)(Fcos(theta))=0.86dF
t2 = (2d)(f) = 2dF
t3=(3d)(F)(cos(theta) = 1.5dF
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A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force
5 meters from the fulcrum. What is the mechanical advantage? (1 point)
0 3
O 75
O 12
04
According to the question, the effort force is 15 meters from the fulcrum, while the load force 5 meters from the fulcrum. The mechanical advantage is 4.
What is mechanical advantage?
Mechanical advantage is the ratio between the output force of a machine and the input force. It is used to compare the amount of work put in to the amount of work done. It is the measure of how much a machine multiplies the force applied to it or reduces the amount of force needed to do a certain task. Basically, it is the measure of how efficient a machine is. By using mechanical advantage, a machine can increase the output force or reduce the amount of force needed to do a certain task. This allows machines to be used to complete tasks that would be difficult or impossible to do using just human strength.
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suppose there is an astronaut who is traveling at a significant fraction of the speed of light d=4.25 , v=0.80277c
All of your clocks tick at the same rate, and your brain experiences the same effects of time that your clock does.
It is difficult to see your own clocks slowed since a clock that is not slowed down must be used to measure it.
As a result, an astronaut sees the clock and the passage of time as usual. The time on Earth appears to go more slowly in the astronaut's perspective than it does on Earth. The ship appears to be in good condition (it doesn't move in relation to the astronaut), but everything else—including the distance system to stars in the direction of travel—seems to have been compressed. In just 5 years, an astronaut can travel to a star located 10 light years away using the following method: the star is closer to Earth in the astronauts' perspective.
The complete question is- Suppose an astronaut is moving relative to the Earth at a significant fraction of the speed of light. a. Does she observe the rate of her clocks to have slowed?
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when [s] = 5 km, what percentage (%) of vmax has been reached?
The percentage of the ratio of Vo/ Vmax is 83%
The [s] given has 5 km
The Vmax can be found using the Michaelis-Menten equation,
Vo / Vmax = [s] / km + [s]
where Vo is the initial velocity
Vmax is the maximum velocity
The Michaelis-Menten equation can be rewritten as V = Kcat [enzyme] [S] / (Km + [S]). Kcat is equal to K2 and measures the number of substrate molecules that the enzyme "turns over" per second. The unit of Kcat is 1/sec.
Let us substitute the known values in the above equation, we get
Vo / Vmax = 5 km / km + 5km
= 5 km / 6 km
= 0.833 x 100
= 83.3 %
Therefore, the percentage of Vo/Vmax is 83.3 %
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The full question is
when [s] = 5 km, what percentage (%) of Vo/Vmax has been reached?
Calculate the energy needed to change 10 grams of water from 70°C to 110°C. 5.7 kcal 350 kcal 0.35 kcal 5700 kcal
The energy needed for change 10 grams of water is 5.7.
What is Energy ?Energy is the ability to perform work in physics. It could exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc.
Energy is always assigned based on its nature once it has been transmitted. Thus, heat transmitted may manifest as thermal energy while work performed may result in mechanical energy.
Motion is a property of all energy types. For instance, if a body is moving, it possesses kinetic energy. Even while at rest, a tensioned object like a spring or bow has the ability to move; this is because of its design, which includes potential energy.
Therefore, The energy needed for change 10 grams of water is 5.7.
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A traveler pulls a suitcase
95.2 m with a 17.9 N force
directed at a 61.3° angle.
How much work does she do?
(Unit = J)
She does 818J work, which is the transfer of energy to or from an item by the application of force along a displacement.
What does "work" imply in the context of physics?Work is the energy that is transferred when a force acts on an item and moves it. The sum of the force's magnitude, the displacement's magnitude, and the angle's cosine determines the work that a force produces on an item.
What does "labor" mean in its simplest form?Work is force transferred across a distance. Examples of labor include pushing a car up a hill, drawing a captive helium balloon down, and raising an object against the gravitational attraction of the Earth. The mechanical expression of energy is work. The
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A 2000-horsepower electric railroad locomotive gets its power from an overhead wire with 0.25 ohm/km. The potential difference between wire and track is 10 kV. Current returns through the track, whose resistance is negligible. How much current does the locomotive draw? How far from the power plant can the train go before 1% of the energy is lost in the wire?
The locomotive draws a current of 40,000 amps.The train can go 5,000 km before 1% of the energy is lost in the wire.
What is energy ?
Energy is the ability to do work. It can be used to power machines and other devices, generate electricity, or heat and light our homes. Energy is also a measure of how much work can be done in a given time. It is measured in Joules (J).
The current drawn by the locomotive is given by I = V/R.
where V is the potential difference between the wire and track and R is the resistance of the wire (in this case 0.25 ohms/km).
Therefore, the current drawn by the locomotive is
I = 10,000 V/0.25 ohms/km = 40,000 A
The distance from the power plant at which 1% of the energy is lost in the wire is given by d = R*I²/2V
where R is the resistance of the wire, I is the current drawn by the locomotive, and V is the potential difference between the wire and track. Therefore, the distance from the power plant at which 1% of the energy is lost in the wire is
d = 0.25 ohms/km * (40,000 A)²/2 * 10,000 V = 5,000 km
This means that the locomotive can travel up to 5,000 km from the power plant before 1% of the energy is lost in the wire.
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which word best describes the motion of a liquid atom
Answer:
Classical Brownian motion
Explanation:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
The term “classical Brownian motion” describes the random movement of microscopic particles suspended in a liquid or gas.
a 40.0 kg block of lead is heated from -25°c to 200.°c. how much heat is absorbed by the lead block? the specific heat value of lead is 130 j/kgoc.
To melt 2 kg of ice 835.48 KJ of heat is required.
Total heat = Heat required to convert 2 kg of ice to 2 kg of water at 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C.
Heat=mhfg+mCpΔT
Here, m ( mass of ice) = 2 kg
hfg (latent heat of fusion of ice) = 334 KJ
Cp of water (specific heat) = 4.187 KJ/Kg-K
ΔT(Temperature difference) = 20 °C
Therefore, Heat required = 2 x 334 + 2 x 4.187 x (20 - 0 )
Heat reqd= 835.48 KJ
Therefore, to melt 2 kg of ice 835.48 KJ of heat is required
What is heat?
Heat is defined as a form of energy crossing the boundary of a thermodynamic system due to a temperature difference across that boundary.A thermodynamic system does not contain heat. However, the term is also often used to refer to the thermal energy contained in a system as part of its internal energy, which is reflected in the temperature of the system.To know more about heat, click the link given below:
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If the length and diameter of a wire of circular cross section are both doubled, the resistance is
A.) increased fourfold.
B.) doubled.
C.) unchanged.
D.) halved.
E.) None of these are true.
R = I/A, Resistance is inversely proportional to the circular cross section and directly proportional to the length of a wire. Therefore, the resistance is unaltered. The correct choice is c.
Additionally, the Greek uppercase letter omega is used to denote the resistance unit, which is the ohm. Additionally, the voltage applied across a specific resistor and the current passing through it affect the resistance. Resistance is a unit of measurement for the resistance to current flow in a certain electrical circuit. The area of a 3D object's sliced cross section, like a pipe, is known as the cross sectional area. The cross sectional area for the top portion of the sliced component will be determined when a pipe is cut perpendicular to its longest axis.
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while the penumbra of a sunspot can "grow" and become bigger. What do you think this means? What is the significance of it for us on Earth
The significance is that the area around the sunspot is becoming darker and larger.
What are sunspot and why do they occur?
Sunspots are dark, cooler regions on the surface of the sun that appear dark in contrast to the surrounding brighter regions. They are caused by intense magnetic activity that impairs the flow of heat and energy from the sun's interior. Sunspots are most commonly found near the poles of the sun, and can vary in size from just a few hundred to many thousands of kilometers in diameter. Sunspots can last for days, weeks, or even months depending on their size and activity.
This is significant for us on Earth because sunspots are associated with increased solar activity, which can lead to changes in Earth’s magnetic fields. This can cause geomagnetic storms and additional radiation reaching Earth’s surface, which can disrupt power grids, radio transmissions, and other electronic systems.
Therefore, the sunspot is becoming darker and larger.
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