Hello friend! Hope you find this response helpful! :)
If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion. Or, the force can act against the motion.
Assuming that no outside forces are acting on ma or mb, which of the following expression BEST represents the speed, v' of the masses after the collision?
Answer: B
Explanation:
The conservation of momentum states that the initial momentum of the system must equal the final momentum of the system. Our system in this case is the two colliding objects and ONLY the two colliding objects. Initially, our system had mass 1 moving towards a stationary mass 2. The stationary mass has a velocity of 0m/s and therefore has no momentum. The initial momentum would then be:
[tex]p_i=m_1v_1_i+m_2v_2_i[/tex]
[tex]p_i=m_1v_1_i[/tex]
The final momentum depends on what type of collision occurred. This case is the simplest type of collision, when the objects stick to each other and act as one. Since the objects move together, their velocity must be the exact same. Our final momentum looks like:
[tex]p_f=m_1v_f+m_2v_f[/tex]
[tex]p_f=v_f(m_1+m_2)[/tex]
Setting the initial momentum equal to the final momentum:
[tex]p_i=p_f[/tex]
[tex]m_1v_1_i=v_f(m_1+m_2)[/tex]
Solving the final velocity:
[tex]v_f=m_1v_1_i/(m_1+m_2)[/tex]
Which matches answer B
Kamaria is learning how to ice skate. She wants her mother to pull her along so that
she has an acceleration of 0.80 m/s2. If Kamaria's mass is 27.2 kg, with what force does
her mother need to pull her? (Neglect any resistance between the ice and Kamaria's
skates.)
“Physics”
Answer:
21.76J
Explanation:
F=ma
where:
m=mass
a=acceleration
Kamaria's mother should pull her with a force of 21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s².
What is Force?
In order to accelerate a body of mass 'm kg' with an acceleration of 'a m/s²', a force of magnitude equal to the product of mass and required acceleration is required. Mathematically -
F = m x a
Given is a girl learning how to ice skate. She wants to move with an acceleration of 0.80 m/s² and her mass is 27.2 kg.
From the definition of force, we can write -
F = m x a
F = 27.2 x 0.8
F = 21.76 Newton
Therefore, Kamaria's mother should pull her with a force of 21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s²
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What do all types of electromagnetic radiation have in common? choose more than one answer.
short wavelength
stream of photons
energy in atoms
only from radioactive material
speed of 300,000 kilometers per second
travel through vacuum of space
Answer:
Explanation:
Let's go through each one.
short-wavelength - not all of them got short wavelengths.
stream of photons - yup, they all got a stream of photons, but the longer wavelengths' photons don't carry much energy such as the shorter wavelengths.
energy in atoms - yes, all wavelengths have energy, the short wavelengths carry more energy than the longer ones.
only from radioactive material - not at all. Radio waves and microwaves are not radioactive! only the wavelengths that carry a large amount of energy are radioactive - these are the shorter wavelengths - these might be gamma rays and x-rays.
speed of 300,000 kilometers per second - yes! all electromagnetic radiation travels at this speed! isn't it amazing?
travel through vacuum of space - yup, all of them.
Hope this helps!
The WHITE numbers painted on the left side of the table will inform us of...
A. the number of valence electrons
B. the number of energy levels around the nucleus
C. the number of protons in the nucleus
D. the number of neutrons in the nucleus
Answer:
a,this help to know the
period in which an element belong to,which also talks about the oxidation number or state of this uncombined element
What is a scientific theory?
1. a testable guess that predicts how variables are related in an experiment or model system, often expressed as an if-then statement
2. an explanation of that natural world that has been repeatedly confirmed through observation and experimentation and is accepted by the scientific community
3. the description of the relationships between observable phenomena
4. a guess or prediction about the natural world with no evidence that some people believe and some people do not believe
WHOEVER ANSWERS CORRECTLY AND FIRST WILL GET BRAINLIEST
Answer:
2. an explanation of that natural world that has been repeatedly confirmed through observation and experimentation and is accepted by the scientific community.
A train accelerates from 23m/s to 190m/s in 54 seconds. What was its acceleration?
Answer:
Use the method on the image and solve it.
The train is accelerating with an initial velocity of 23 m/s, a final velocity of 190 m/s in the time period of 54 seconds, then the acceleration will be 3.09 m/s².
What is velocity?Velocity is the measurement of a particle's or object's displacement with relation to time. The recognized unit of magnitude for velocity is the meter per second (m/s) (also known as speed).
There are several ways to show a velocity vector's direction, depending on how many dimensions are provided.
The given values in the question are,
Initial velocity, u = 23 m/s
Final velocity, v = 190 m/s and,
Time, t =54 seconds.
By putting the formula of the equation of motion :
v = u + at
190 = 23 + (a)(54)
a = 167/54
a = 3.09 m/s².
Hence, the acceleration of the train is equal to 3.09 m/s².
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3 A spider runs along the top of a wall at a speed of 0.24 m/s. How far will it run
in 5 s?
Answer:
The answer is 1.2 mExplanation:
In order to find the distance covered we use the formula
distance = velocity × timeFrom the question
velocity = 0.24 m/s
time = 5 s
We have
distance = 0.24 × 5
We have the final answer as
1.2 mHope this helps you
A train is moving with a velocity of 20 m/s. when the brakes are applied the acceleration is reduced to -0.6 m/s².calculate the distance covered by the train before coming to rest
Answer:
x = 333.33 [m]
Explanation:
To solve this problem we must use the following kinematics equation.
[tex]v_{f}^{2} = v_{i}^{2}-(2*a*x)[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 20 [m/s]
a = desacceleration = 0.6 [m/s^2]
x = distance [m]
Note: the final speed is zero as the body finishes its movement.
Now replacing:
0 = (20)^2 - (2*0.6*x)
1.2*x = 400
x = 333.33 [m]
Can someone please help me ASAP
If light travels at 3.00 x10^8 m/s, how long will it take light from the sun to reach a planet that is 6.45 light years away? How far will the light have traveled in meters? (Light year- distance travelled by light in one year. Use a value of exactly 365 days for a year.)
Answer:
distance = 6.1022 x10^16[m]
Explanation:
To solve this problem we must use the formula of the average speed which relates distance to time, so we have
v = distance / time
where:
v = velocity = 3 x 10^8 [m/s]
distance = x [meters]
time = 6.45 [light years]
Now we have to convert from light-years to seconds in order to get the distance in meters.
[tex]t = 6.45 [light-years]*365[\frac{days}{1light-year}]*24[\frac{hr}{1day}] *60[\frac{min}{1hr}]*60[\frac{seg}{1min} ] =203407200 [s][/tex]
Now using the formula:
distance = v * time
distance = (3*10^8)*203407200
distance = 6.1022 x10^16[m]
Find the weight (W) of a 60 kg table.
g on earth is
9.8 m/s2
Explanation:
Weight = Fg = mg = (60 kg)*(9.8 m/s2) = 588 N.
True or False:
If an object is more dense than
water it will float.
Plzzzz Help me
Answer:
it will sink because object that have less they float not more
Answer:
it will sink here's why
Explanation: The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.
When you double the voltage across a certain material or device, you observe that the current increases by a factor of 3.
Explanation:
The current which flows through the circuit is dependent on the resistance of the material/device. Given by the equation U=RI
If U becomes 2U
And I becomes 3 I
then R×2=3
R=3/2=1.5 Ω
Hope this answers your question?
How much heat is absorbed by 0.050kg of lead when it is heated from 20°C to 100°C?
Answer:
Mass of substance m = 0.050Kg
Initial Temperature T₁ = 20°C
Final Temperature T₂ = 100°C
we have to calculate the heat absórbed by the lead .
Since spècific heat of lead is not gíven so we will take spècific heat of lead 128 J/kg°C
[tex] \diamond \bf \: Q\: = m \times c( \Delta \: t) [/tex]Put the given value
[tex]\sf \longrightarrow \: Q = 0.050 \times 128 \times (100 - 20) \\ \\ \\ \sf \longrightarrow \: Q = 0.050 \times 128 \times (80) \\ \\ \\ \sf \longrightarrow \: Q = 6.4 \times 80 \\ \\ \\ \sf \longrightarrow \: Q = 512 \: joules[/tex]
Therefore,
Heat absórbed by the lead is 512 Joules.A wave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced? 0.67 m 0.75 m 1.5 m 3.0 m
Explanation:
velocity = frequency × wave length
33 = 22 × wave length
wave length = 33 ÷ 22 = 1.5 m
this is the correct answer Step-by-step
I hope you understand...
can you please mark my answer
Answer:
C
Explanation:
EDGE22
A cruise ship has a mass of 100,000,000 kg and a kinetic energy of 5,000,000 kJ. Calculate the speed of the cruise ship.
Explanation:
K.E = 5,000,000 KJ
MASS = 100,000,000 Kg
K.E = 1/2 MV^2
[tex]5000000 = \frac{1}{2} \times 100000000 \times v {}^{2} [/tex]
[tex]5000000 = 50000000 \times v {}^{2} [/tex]
[tex]v {}^{2} = \frac{5000000}{50000000} [/tex]
[tex]v {}^{2} = \frac{5}{50} [/tex]
therefore
[tex]v {}^{2} = \frac{1}{10} [/tex]
[tex]v = \sqrt{0.1} [/tex]
v = 0.316 m/s^2
The velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s
What is Kinetic Energy?The Kinetic energy of the body is the energy possessed by body by virtue of its motion.
Given is a cruise ship that has a mass of 100,000,000 kg and has a kinetic energy of 5,000,000 kJ. From this, we can write -
Mass [M] = 10⁸ Kg
Energy [E] = 5 x 10⁶ KJ = 5 x 10⁹ J
The formula to calculate the Kinetic energy of the body is -
E [K] = E = 1/2 mv²
v² = 2E/m
v² = (2 x 5 x 10⁹)/10⁸
v² = 100
v = √100
v = 10 m/s
Therefore, the velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s
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An 11-year-old girl’s height increased by several inches in three months. Which example of the characteristics of life is most similar?
A)An octopus camouflages with the ocean floor.
B)A giraffe eats leaves off a tree.
C)A bee stings a person who is swatting it away.
D)A kitten gains weight.
E)A butterfly moves pollen from one flower to another.
Answer:
D: A kitten gains weight.
Explanation:
If you pull back on a rubber band with a rock in it and then let go, which is this an example of.
Answer:
elastic potential energy
Explanation:
The situation above shows an example of an "elastic potential energy." This type of potential energy depends on the force being applied to the elastic object.
In the situation above, the elastic object is the rubber band. The resultant energy is then being stored until such time that this object will be freed. Once this happens, the elastic object will revert to its original form and the rock will soar (be released).
The amount of energy that is being stored largely depends on the distance of the "stretch" being applied to the object. It is said that the greater the force, the greater the stretch and the greater the distance covered by the rock (and vice-versa).
What is the formula used to calculate density?
[tex]\Large \boxed{\displaystyle density \ (kgm^{-3})=\frac{mass\ (kg)}{volume \ (m^3)} }[/tex]
You drop your frozen rock from a green bridge. The frozen rock starts from rest (initial velocity = 0ms). The rock takes 4.3s to hit the water below. The acceleration due to gravity on Earth is 9.8m\s2 s 2 downward. What is the frozen rocks velocity after 1.5 seconds? vf = vi + at
Answer:
The velocity of the frozen rock at [tex]t = 1.5\,s[/tex] is -14.711 meters per second.
Explanation:
The frozen rock experiments a free fall, which is a type of uniform accelerated motion due to gravity and air viscosity and earth's rotation effect are neglected. In this case, we need to find the final velocity ([tex]v[/tex]), measured in meters per second, of the frozen rock at given instant and whose kinematic formula is:
[tex]v = v_{o} + g\cdot t[/tex] (Eq. 1)
Where:
[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.
[tex]g[/tex] - Gravity acceleration, measured in meters per square second.
[tex]t[/tex] - Time, measured in seconds.
If we get that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]g = -9.807\,\frac{m}{s^{2}}[/tex] and [tex]1.5\,s[/tex], then final velocity is:
[tex]v = 0\,\frac{m}{s}+\left(-9.807\,\frac{m}{s^{2}} \right) \cdot (1.5\,s)[/tex]
[tex]v = -14.711\,\frac{m}{s}[/tex]
The velocity of the frozen rock at [tex]t = 1.5\,s[/tex] is -14.711 meters per second.
What keeps all of the planets in the solar system from leaving their orbits around the sun?.
explain the statement the potential difference between two points is 1 volt
Answer:
When 1 Joule of work is done to move a charge of amount 1 Coulomb from one place to another, then it is said that the potential difference between the two points is 1 Volt (V)
what is reference frame
Answer: A reference frame is simply a perspective, context, or point of view. In physics that typically means physical space time coordinates, in the social sciences it takes on a slightly different meaning. In both fields, everything is relative to the point of view of the observer ( relativity ).
Explanation:
Answer:
In physics, a frame of reference consists of an abstract coordinate system and the set of physical reference points that uniquely fix the coordinate system and standardize measurements within that frame. For n dimensions, n + 1 reference points are sufficient to fully define a reference frame.
Explanation:
Also called reference frame. Physics. a framework that is used for the observation and mathematical description of physical phenomena and the formulation of physical laws, usually consisting of an observer, a coordinate system, and a clock or clocks assigning times at positions with respect to the coordinate system.
Reference frame, also called frame of reference, in dynamics, system of graduated lines symbolically attached to a body that serve to describe the position of points relative to the body.
Choosing a frame of reference requires deciding where the object's initial position is and which direction will be considered positive. ... Frames of reference are particularly important when describing an object's displacement. Displacement is the change in position of an object relative to its reference frame.
Actually, frames of references are classified into two types depending upon how they are moving. Those two types are called inertial and non-inertial frames of reference. An inertial frame of reference has no acceleration. The law of inertial holds in such a frame; no fictitious forces arise.
if the diameter of a wire were decreased it's electrical resistance would
A 248 kg object moving at 19m/s comes to stop over a distance of 38 m. What is the coefficient of kinetic friction between the surfaces?
Answer:
μ = .4842
Explanation:
Assuming constant acceleration and the object is sliding on a level surface:
Let's start off by finding the acceleration of the object.
v₀ = 19 m/sv = 0 m/sΔx = 38 ma = ?v² = v₀² + 2aΔx
0² = 19² + 2a(38) 0 = 361 + 76a -361 = 76a a = -4.75 m/s²Now, we can make a free-body diagram and see that the only force opposing the object's motion is the friction force -- this is the only force in the x-direction.
We can use Newton's 2nd Law: F = ma to solve for the coefficient of friction.
F = ma
F = friction force = μ * N = μ * mgNow, we have:
μ * mg = maThe mass cancels out and solving for the coefficient of friction gives us:
μ * g = a μ = a/gWe know the acceleration is -4.75 m/s² and g = -9.81 m/s²:
μ = -4.75/-9.81 μ = .4842The coefficient of kinetic friction between the surfaces, assuming constant acceleration and a flat surface, is 0.4842.
The red and yellow car get into a collision. Before the collision, each car had a momentum of 5 kg.m/s. After the collision, the yellow car now has a momentum of 0. What is the momentum of the red car after the collision?
Answer:
10 kg-m/s
Explanation:
It is given that,
Before the collision, each car (red+yellow) had a momentum of 5 kg.m/s.
After the collision, the yellow car now has a momentum of 0.
We need to find the momentum of the red car after the collision. The conservation of momentum will be applied in this problem. A/c to this law,
Momentum before collision = Momentum after collision
[tex]p_r+p_y=p'_r+p'_y[/tex]
[tex]5+5=0+p'_r\\\\p'_r=10\ kg-m/s[/tex]
Hence, the momentum of the red car after the collision is 10 kg-m/s.
Describe some tests that could be done to determine what an unknown substance is.
Answer:
by finding melting and boiling points
Explanation:
Answer:
Simple chemical tests can be used to identify the presence of various elements or classes of molecules (Tollen's test). ... Electron spin resonance (ESR): Also referred to as electron paramagnetic resonance (EPR), this method uses the spins of unpaired electrons in molecules to determine structure
You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has
stopped in front of it.
Answer:
It would move forward.
Explanation:
how to draw bohr model
Answer:
Drawing Bohr Models
1. Draw the nucleus.
2. Write the number of Protons and Neutrons in the nucleus
3. Draw the first shell
4. Add the electrons, the first shell can only hold 2
5. Draw the next shell if you have more electrons to add
6. Add your electrons, the 2nd shell can hold up to 8
7. Check yours Valence electrons
Explanation:
give answer in decimal to the nearest tenth of a cm
A student is gliding along on a scooter at a comfortable 2.8 m/s when Mr. Jones walks around the corner and the two collide. If the student is brought to rest in 0.15 s, what is their acceleration (hint: should it be acceleration or deceleration)?
Answer:
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]
Explanation:
Acceleration is a quantity that indicates how the speed of the object changes over time. In other words, acceleration is a vector quantity that relates changes in velocity to the time it takes to occur. It is normally represented by the letter a and its unit of measurement, in the International System it is meters per second squared [tex]\frac{m}{s^{2} }[/tex].
The mathematical expression for the acceleration is:
[tex]a=\frac{final speed - initial speed}{final instant - initial instant}[/tex]
In this case:
final speed= 0 [tex]\frac{m}{s}[/tex]initial speed= 2.8 [tex]\frac{m}{s}[/tex]final instant=0.15 sinitial instant= 0 sReplacing:
[tex]a=\frac{0 \frac{m}{s} - 2.8\frac{m}{s} }{0.15 s - 0s}[/tex]
a= -18. 667 [tex]\frac{m}{s^{2} }[/tex] ≅ -19 [tex]\frac{m}{s^{2} }[/tex]
Deceleration is a quantity that expresses the passage of a moving body from one speed to a lower speed. Mathematically it is calculated as the acceleration but the result will be a negative acceleration.
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]