Salt water has a greater density than freshwater. a boat floats in both freshwater and salt water. the buoyant force on the boat in salt water is greater that in freshwater.
The buoyant force on a boat is determined by the density of the fluid in which it floats. Since salt water has a greater density than freshwater, the buoyant force on the boat in salt water is greater than that in freshwater. This means that the boat will float more easily in salt water than in freshwater.
The buoyant force is the upward force exerted by a fluid on an object immersed in it. It is equal to the weight of the fluid displaced by the object. The weight of the fluid displaced depends on the density of the fluid. Since salt water has a greater density than freshwater, it displaces more weight of water than an equivalent volume of freshwater. Therefore, the buoyant force on the boat in salt water is greater than in freshwater.
This is why boats that are designed to operate in salt water are typically larger and heavier than those designed for freshwater. They need to displace more weight of water to stay afloat. Additionally, boats designed for salt water are often made of materials that are more resistant to corrosion and damage from salt water.
In summary, the buoyant force on a boat in salt water is greater than that in freshwater due to the higher density of salt water. This has important implications for the design and operation of boats in different bodies of water.
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A 4 kg toy car moves horizontally on a rough road with coefficient of kinetic friction 0.2. It accelerates from rest to 20 m/s in 10 s. Find (a) the total work done on the car
The total work done on the car is 784Joule.
What's the acceleration of the car?As per Newton's equation of motion, V= U+atU= initial velocity= 0 m/sV= vinal velocity= 20m/s
t= time = 10s
a= acceleration
So, 20= 0+ 10a=> a= 20/10= 2m/s²
What's the distance covered by the car in 10 seconds?As per Newton's equation of motion,V²-U² = 2aS
S= distance covered by the carSo, 20²-0=2×2×S=4S=> 400= 4S
=> S= 400/4= 100m
What's the work done on the car due to frictional force?Work done by frictional force= frictional force × distance
= (0.2×4×9.8)×100
= 784Joule
Thus, we can conclude that the work done on the car is 784Joule.
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According to present scientific understanding of the Milky Way's formation, which of the following statements are true
Halo stars formed before disk stars and the protogalatic cloud(s) contained essentially no elements besides hydrogen and helium.
Halo starsThe hierarchical growth of huge galaxies like the Milky Way results in the natural by-product of extended star haloes. Our galaxy's star halo should contain traces of past merger events if this process is a significant contributor to the galaxy's expansion. However, it is difficult to reliably identify real halo stars. Aims. We have entered a new phase of galactic astronomy with the launch of the Gaia space telescope. Over two million stars the majority of which are in the solar neighbourhood have their locations, parallaxes, and proper motions listed in the initial Gaia data release. This sample will be expanded to include more than 1.5 billion stars in the second Gaia data release, of which 5 million will be fully phase-space characterized stars.
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Read the following question and answer it using complete sentences. Be sure to fully explain your answer.
What energy conversion is happening when wave power is used?
Wave power involves conversion of mechanical energy to electrical energy.
What is wave power?We know that energy conversion is part of the postulations of the first law of thermodynamics which states that energy can neither be created nor destroyed but can be transformed from one form to another.
Now, the wave power can convert the regular up and down movement of the ocean waves into a source of electricity. This implies that the energy that is taking place here is the conversion of mechanical energy to electrical energy.
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A car is traveling north on a straight road at 20 mys and a drone is flying east at 6 mys at an elevation of 25 m. At one instant the drone passes directly over the car. How fast is the distance between the drone and the car changing 5 seconds later
The distance between the drone and the car will be 20,3 m/s.
What is average velocity?
In physics, velocity is a quantity that identifies the displacement of a body in a given time. Thus, the average velocity measures in an average time interval, the speed of displacement of a body.
With that being said, Suppose that both car and drone starts from 0 and move towards north and east, respectively. So, after T time:
Distance covered by the car, [tex]y = 20.T.m[/tex]
Distance cover by the drone, [tex]x = 6.T.m[/tex]
Considering the elevations of 25m, the actual distance between them at any T instant:
[tex]A = \sqrt{(20T)^{2} } + (6T)^{2} +25^{2}[/tex]
Speed, [tex]V = \frac{ds}{dt} = \frac{[2(20T).20+2(6T).8}{\sqrt{(20.5)^{2}+(6T)^{2}+25^{2} } }[/tex]
[tex]V = 20,3 m/s[/tex]
So, the distance between the drone and the car will be 20,3 m/s.
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Answer:
20.3 m/s
Explanation:
dx / dt = 20 m / s
dy / dt = 6 m / s
dj / dt = ? when t = 5 s
The trick here is that the drone is flying at an elevation of 25 m.
x^2 + y^2 = j^2
Implicit Differentiation: 2x dx / dt + 2y dy / dt = 2j dj / dt
We are not given x and y values. Solve by d = vt. Distance = velocity * time
x = 20(5) = 100 m
y = 6 (5) = 30 m
Now we need to solve for j, but we need to solve the hypotenuse z of the right triangle first.
z = [tex]\sqrt{(100)^2 + (30)^2[/tex] ≈ 104.4 m
A mistake occurs when z is used as the distance between the drone and the car. Visualize the distance between the drone and the car as the right triangle where j is the hypotenuse, z is the x value, and 25 m is the y value.
j = [tex]\sqrt{(104.4)^2+(25)^2[/tex] ≈ 107.35 m
dj / dt = 1 / 2(107.35)((4000 + 360)) ≈ 20.3 m/s
Thinking about planck's law, which star would give off the most orange light?
Thinking about Planck's law, the Red star would give off the most orange light.
According to Planck's Law, distinct atoms and molecules can emit or take in power in discrete portions simplest. The smallest amount of strength that can be emitted or absorbed inside the form of electromagnetic radiation is called quantum.
Planck's Law describes the quantity of spectral radiance at a particular wavelength radiated through a black body in equilibrium. The equation is E=hv.
The floor temperature of a celeb determines the color of mild it emits. Blue stars are warmer than yellow stars, which are hotter than red stars. The bright orange celebrity Arcturus is particularly noteworthy for its massive right motion, The color is a characteristic of their floor temperatures.
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A ray of light strikes a boundary between two transparent materials, and there is no transmitted ray, as shown in the figure. What can you conclude about the indices of refraction of these two materials
Answer:q
Explanation:
In the paralleling technique, the central ray of the x-ray beam must be _____ to the film sensor and the long axis of the tooth.
The film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.
To find the answer, we need to know above the paralleling technique in the dental x-ray.
What is paralleling technique?The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion. The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion.The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.When preparing for an x-ray, it is imperative to keep in mind the root anatomy.The maxillary occlusal plane of the patient should also be parallel to the ground.Thus, we can conclude that, the film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.
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About how many kwh does the solana parabolic trough solar array generate in a month?
An array of this size can produce an average of 350-850 kWh of AC energy per month.
Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.
Solar panel systems are measured in terms of kW. A common size solar panel array is usually around 5kW. An array of this size can produce an average of 350-850 kWh of AC energy per month.
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What happens in a parallel circuit when you increase the number of bulbs
As more bulbs are added in parallel, the current strength will decrease OR. As more bulbs are added in parallel, the current strength will increase.
Fire spreading from a wall to a nearby couch due to radiant heat transfer is an example of: Select one:
Fire spreading from a wall to a nearby couch due to radiant heat transfer is an example of heat reflectivity.
What is heat reflectivity?
When sunlight and other light sources strike a material's surface, its reflectance is measured. This number can be used to characterize a surface's characteristics in terms of surface finish. Another name for reflection is reflectivity.
This is a measurement of the amount of energy that material reflects at a specific wavelength. A value between 0 and 1 can also be used to represent reflectivity (or a percentage between 0 and 100).
Sigma and other top businesses have created a range of other forms of heat reflective fabric in the 50 years after the creation of space blankets, including Fabric and aluminum foil laminates, fabric laminates with metalized thin films.
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An object starts at rest. Its acceleration over 30 seconds is shown in the graph below:
Answer:6m/s
Explanation:as you can see before twenty seconds there was no change in speed,but between twenty to thirty seconds,the speed changed from 0m/s to 6m/s,so change in speed is 6m/s.
The speed of an object between 20 and 30 seconds shown in the graph is 70 m/s.
Given:
Time, ΔT = 30-20 = 10s
Acceleration, a = 7 m/s²
The speed can be computed from the acceleration and time. The standard unit of velocity is meters per second.
For the given case, the speed can be computed from the acceleration and time given in the graph.
The speed is given as:
a = v/t
v = at
v = 7×10
v = 70 m/s
Hence, the speed of an object between 20 and 30 seconds shown in the graph is 70 m/s.
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As the number of protons in an atom’s nucleus increases
a) The overall stability of the atom decreases
b) The number of electrons must increase to maintain the atom’s overall neutral charge
c) The more neutrons are required to stabilize the nucleus
d) All of the above
As the number of protons in an atom’s nucleus increases, the number of electrons must increase to maintain the atom’s overall neutral charge; option B.
What is atomic number of an element?Atomic number is the number of protons present in the nucleus of an atom.
The atomic number of atoms of elements increase with increase in atomic number.
In conclusion, atomic number increases the size down a group and decreases atomic size across a period.
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An AP Physics student is attempting an FRQ problem. They arrive at the following expression for the total distance an object has traveled:
d = 2vh/g
All you know about the variables in this problem are their dimensions:
[v] = distance/time, [h] = distance, and [g] = distance/time^2.
Given this information, explain why the student’s answer must be wrong.
The student's answer is wrong because the unit of his answer is meter - seconds which is not unit of distance (meter).
Total distance traveled by an object
The total distance traveled by an object projected upward is calculated from third equation of motion a shown below.
Equation for the motion of the objectv² = u² - 2gh
where;
v is final velocityu is initial velocityg is acceleration due to gravityat maximum height, the final velocity is zero, v = 0
0 = u² - 2gh
2gh = u²
h = u²/2g
The equation for the total distance an object has traveled during upward projection is "h = u²/2g".
Dimension of the student's answer;d = (2vh)/g = (m/s x m) / (m/s²) = (m²/s) / (m/s²) = m.s
Thus, the student's answer is wrong because the unit of his answer is meter - seconds which is not unit of distance (meter).
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Rosa pours a cup of boiling water into a pot of room-temperature water. According to the second law of thermodynamics, what will occur
Thermal energy from the room-temperature water will continuously flow to the boiling water.
The second law states, in a straightforward manner, that heat cannot naturally go "uphill." When a pan of boiling water and a pan of ice are in touch, the hot water cools and the ice melts and warms up.THE FIRST LAW OF THERMODYNAMICSAdiabatic Process - is a procedure that is carried out without the system's heat content changing. Water is heated to a temperature of 1000C during the boiling process, making it an isothermal process. As steam, the excess heat leaves the system.Learn more about first law of thermodynamics brainly.com/question/3808473
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How does quantum theory explain the emission spectra of atoms?
The quantum theory opines that electron in atoms occur a discreet energy levels.
What is the quantum theory?The quantum theory was initiated by the idea of Max plank. In this idea, energy was viewed as occurring in discrete amounts. This idea was first applied to the phenomenon of the black body radiation hence the Plank Equation; E = hf.
Now Neils Bohr pushed the idea further by putting forward the opinion that when an electron in atom is found in an orbit, it does not radiate energy. The atom was thus visualized as being composed of several energy levels and radiation can only occur when an electron moves from a higher to lower energy level.
This implies that the energy of each electron in an atom is quantized. Thus implies that it has a value which an integral multiple of a fundamental amount.
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2. A spacecraft travels at 2 x 108 m/s relative to Earth. An astronaut on board listens to a CD that lasts 50 min.
How long would the CD last as measured by a stationary clock on Earth?
3. A linear particle accelerator is a special machine that accelerates charged particles to nearly the speed of light
and channel them into a beam. When used in research, the beam hits targets and the atoms split. Scientists
gather information about sub-particles, atoms and molecules to further help understand the laws of physics.
A proton of a mass 1.67 x 10–27 kg is accelerated to 0.999 994c. Calculate the ratio of the proton’s relativistic
momentum to the non-relativistic momentum
This is a time dilation exercise. The time taken for the CD to last as measured by a clock on earth is given as: 67.08 minutes.
What is time dilation?Under the theory of special relativity, time dilation is the "slowing down" of a clock as determined by an observer in relative motion with respect to that clock.
Recall that the equation for time dilation is given as:
t = t₀/√(1- (v²/c²)
Where:
t₀ is the observer in the space craft
t is the observer on earth
v is the speed of the space craft which is given as 2 x 10⁸m/sec
c is the speed of light which is given as 3 x 10⁸m/sec
Hence
v/c = 2 x 10⁸/ 3 x 10⁸
= 2/3
Thus,
t = 5/√(1-(4/9)
= 50 √(9/5)
= 150/√5
= 150 /2.2361
= 67.08 min
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P waves ________. P waves ________. are faster than S waves and surface waves have higher amplitudes than do S waves propagate only in solids produce the strongest ground shaking
P waves are faster than S waves and surface waves.
Surface wavesA surface wave in physics is a mechanical wave that travels at the interface of two different media. Gravity waves on the surface of liquids, like ocean waves, are an example that is frequently used. When two liquids with different densities come together, gravity waves can also form at that junction. Solid surfaces can experience elastic surface waves like Rayleigh or Love waves. The way that electromagnetic waves can be steered along a gradient in refractive index or at the boundary between two substances with varying dielectric constants is known as "surface wave" propagation. A guided wave that travels relatively close to the Earth's surface constitutes a ground wave in radio transmission.
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In the roman soldier model for refraction, a muddy stream crosses the road they are on walking on at 45. Will the soldiers in the front row all hit the water at the same time?
There are different refractive errors that are common and some of them are:
Nearsightedness (myopia) makes far-away objects look blurry.Farsightedness (hyperopia) makes nearby objects look blurry.Astigmatism can make far-away and nearby objects look blurry or distorted.Presbyopia makes it hard for middle-aged and older adults to see things up closeWhat is Refraction?This refers to the study of light phenomena that deflects when it passes through a medium in an oblique manner to another medium of a varying density.
Hence, we can see that there are everyday examples of refraction in simple terms which occurs and some of them are:
GlassHuman eyesIce crystalsPickle jarMicroscope, etc.Hence, we can see that your question is incomplete, so I gave you a general overview to help you get a better understanding of the concept of refraction.
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Increases in the planet's temperature over the past few decades can be attributed to
Excess Carbon Monoxide(CO) attributed to increases in the planet's temperature over the past few decades
While carbon monoxide (CO) poisoning is the world's most common cause of poisoning death, correlations between CO poisoning and weather are yet unknown.
The incidence risk of acute CO poisoning is influenced by temperature changes, however, the effects vary in Taiwan depending on the season and the person. Our research quantifies the effects of environmental variables and offers essential support for healthcare professionals to create preventive measures to lower the incidence of acute CO poisoning.
An earlier study conducted in Beijing found a negative correlation between temperature and the frequency of acute Carbon Monoxide poisoning. While the impact of other significant weather variables (such as relative humidity and wind speed) on this issue is still unknown, prior research has mostly focused on the relationship between temperature variations and CO poisoning.
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A 500.0 kg elevator is pulled upward with a constant force of 5500.0 N for a distance of 50.0 m. What is the work done by the 5500.0 N force on the elevator?
Group of answer choices
a. -2.45 x 105 J
b. -5.20 x 105 J
c. 2.75 x 105 J
d. 3.00 x 104 J
C. The work done by the 5500.0 N force on the elevator is 275,000 J.
Work done by the applied force
The work done by the 5500.0 N force on the elevator is calculated as follows;
W = Fd
where;
F is the applied forced is the displacementW = 5500 x 50
W = 275,000 J
Thus, the work done by the 5500.0 N force on the elevator is 275,000 J.
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Normally, whem I shut my door, it takes quite a bit of effort to shut it, but when my window is open, even if I just pull it slightly then let go, it slams automatically. It isn't an issue, I just want to know the physics behind it. Is it something to do with difference in pressure?
Answer:
gravity
Explanation:
gravity pulls anything with with weight towards the earth.
Answer
The reason why this occurs is because if there is any apparent wind being pushed towards the direction of the door, there will be an attempt of equalizing pressure and thus it will slam, or close very loudly when you even just push it shut with some effort.
Explanation
This has happened to me a variety of times, I would have the garage open, and it would be a little bit windy, and when I tried to close it, it would slam shut.
Airflow is a significant factor in the pressure appliance.
Your question at the end is correct (Differences in air pressure.)
Apologies for the late response, but I was interested in this as well.
Is the star moving toward earth, away from earth, or is there not enough information provided to determine its motion?
If a star is moving towards Earth, shift towards the blue end of the spectrum, this is called blue shift. If the star is moving away from Earth the light from that star will be red and is called red shift .
The faster a star moves towards the earth, the more its light is shifted to higher frequencies. In contrast, if a star is moving away from the earth, its light is shifted to lower frequencies on the color spectrum
if a star is moving towards Earth, it appears to emit light that is shorter in wavelength compared to a source of light that isn't moving. Because shorter wavelengths correspond to a shift towards the blue end of the spectrum, this is called blue shift.
If the star is moving away from Earth, its light will lose energy to reach Earth, therefore the light from that star will be red and is called red shift
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In the writing of ionic chemical formulas, what factor is "crossed over" in the crossover rule?
In the writing of ionic chemical formulas the value of each ion's charge is crossed over in the crossover rule.
Rules for naming Ionic compounds
Frist RuleThe oxidation state of each ion is also important, thus in the crossover rule, the value of each ion's charge is crossed over.
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7. A 0.5-kg puck is traveling at 3.0 m/s. It strikes a 1.0-kg puck, which is
stationary. The two pucks stick together. What is their final speed after
collision?
A. 1.0 m/s
OB. 2.0 m/s
OC. 2.5 m/s
OD.3.0 m/s
*
1 point
Answer:
A
Explanation:
m1vi1 + m2vi2 = (m1+m2)vf
(0.5×3) + (1×0) = (1 + 0.5)vf
1.5=1.5vf
therefore final speed/velocity is 1m/s
m = mass
vi = velocity initial
vf = velocity final
Suppose we have two planets with the same mass, but the radius of the second one is twice the size of the first one. How does the free-fall acceleration on the second planet compare to the first planet
The free-fall acceleration on the second planet is one-fourth the value of the first planet.
Calculation:
Consider the mass of planet A to be, M
the mass of planet B to be, Mₓ = M
the radius of planet A to be, R₁
the radius of planet B to be, R₂
The acceleration due to gravity on planet A's surface is given as:
g = GM/R₁² - (1)
Similarly, the acceleration due to gravity on planet B's surface is given as:
g' = GM/R₂² [where, R₂ = 2R₁]
= GM/4R₁² -(2)
From equation 1 & 2, we get:
g/g' = GM/R₁² ÷ GM/4R₁²
g/g' = 4/1
Thus we get,
g' = 1/4 g
Therefore, the free-fall acceleration on the second planet is one-fourth the value of the first planet.
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Block A has a weight of 60 lb and block B has a weight of 10 lb. Determine the speed of block A after it moves 5 ft down the plane, starting from rest. Neglect friction and the mass of the cord and pulleys.
The speed of Block A is 7.18 ft/s.
From energy conservation we know that the initial kinetic energy is equal to final kinetic energy.
Block A has weight of 60 lb.
Block B has weight of 10 lb.
In the question it is said that block A moves from rest at a distance of 5ft.
Relative motion constraint-
2sA + sB =l
differentiating we get:
So, 2ΔsA + ΔsB = 0
→ ΔsB = -2ΔsA
2 vA + vB =0
→ vB = -2vA
Now applying principle of work and energy
TA0 +TBO + ΣwO-AB = TA+TB
1/2 mA v²A₀ + 1/2 mBv²B₀ + wAΔsA + wBΔsB = 1/2 mAv²A + 1/2 mBv²B
0 + 0 +6(5) - 10(10) = 1/2 (-60/32-2) v²A +1/2 (10/32.2) 2v²A
vA = 7.18 ft/s
So, the speed of block A is 7.18 ft/s.
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A 70 n force pulls a box straight up 5 m above the ground. How much work is done on the box?
The work done on the box is 350 Joule.
When is Work done on an object ?Work is done on an object when the displacement of the object is not perpendicular to the direction of the applied force. The unit of Work is Joule (J)
Given that 70N force pulls a box straight up 5 m above the ground.
Work is the product of force F and the distance S. That is,
W = F x S
Where
Force F = 70 NDistance S = 5 mSubstitute the two parameters into the formula above
W = 70 x 5
W = 350 J
Therefore, the work done on the box is 350 Joule.
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Visualizing the body in the position is significant because all observers have a common point of reference when describing and discussing its regions.
Visualizing the body in the anatomical position is significant because all observers have a common point of reference when describing and discussing its region.
What is the anatomical position?Anatomical position, also known as conventional anatomical position, refers to the body's position while it is standing erect and looking forward, with each arm hanging on either side of the body and palms facing forward. The legs are parallel, with the feet level on the floor and forward facing. When explaining particular anatomical words and locations in human anatomy and physiology, the anatomical position is a standard point of reference. Visualizing the body in its anatomical location is important because it provides a single point of reference for all observers when describing and discussing its region.As the description itself says, visualizing the body in its anatomical location is important because it provides a single point of reference for all observers when describing and discussing its region.
Therefore, visualizing the body in the anatomical position is significant because all observers have a common point of reference when describing and discussing its region.
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The question you are looking for is given here:
Visualizing the body in the _____________ is significant because all observers have a common point of reference when describing and discussing its region.
1. What happens to the apparent weight when the objects are submerged in water?
As a pendulum moves toward the equilibrium position, velocity and acceleration . As the pendulum moves away from the equilibrium position, velocity and acceleration . Velocity is at a when acceleration is zero.
Answer:
As a pendulum moves toward the equilibrium position, velocity increases and acceleration decreases. As the pendulum moves away from the equilibrium position, velocity decreases and acceleration increases.
Explanation:
Using the law of conservation of energy, we know that Em1=Em2.
Em1 (at the highest point) = Eg + Ek, where Ek is 0
Em2 (at the equilibrium point) = Eg +Ek, where Eg is 0
This makes sense. At the highest point, the pendulum is at its maximum height. At this point, however, it stops moving, so its velocity is 0. At the equilibrium point, the pendulum is at its lowest height (i.e. h=0). At this point, however, its moving at its maximum velocity. This velocity is constant, which means that acceleration is 0.
Answer:
1) Increases
2) Decreases
3) Decreases
4) Increases
5) Maximum
Explanation:
As a pendulum moves toward the equilibrium position, velocity
✔ increases
and acceleration
✔ decreases
. As the pendulum moves away from the equilibrium position, velocity
✔ decreases
and acceleration
✔ increases
. Velocity is at a
✔ maximum
when acceleration is zero.