The boy would lose 25000 Joules going from the top of the hill to the village.
What is potential energy?Potential energy is the energy stored in an object as a result of its position in relative with another object. It is given by:
Potential energy = mass * acceleration due to gravity (g) * height.
g = 10 m/s²
Let us assume the boy has a weight of 50 kg. His starting point is (400, -50) m. This means the hill is 50 m high and 400 m from the village.
Potential energy = 50 * 10 * 50 = 25000 Joules
The boy would lose 25000 Joules going from the top of the hill to the village.
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4. In the image, a rubber balloon is being rubbed back and forth against a wool
scarf. Which of the following is true? *
The balloon lost some electrons to the scarf during the charging process.
The balloon lost all of its electrons to the scarf during the charging process.
After rubbing, the balloon has the opposite charge as the scarf.
The scarf would now be repelled by the balloon.
lost some electrons I think
a sprinter starting from rest reaches final velocity of 18.0 mi/h. What is her average velocity?
Answer:
9m/s
Explanation:
Average velovity= (Initial velocity+Final velocity)/2
or A.V=(0+18)/2
or A.V= 9m/s
A sprinter starting from rest reaches final velocity of 18.0 mi/h. The average velocity of the sprinter is 9.0 mi/h.
Given that the sprinter starts from rest and reaches a final velocity of 18.0 mi/h, we can assume that the sprinter accelerates uniformly. Therefore, her average velocity would be the average of her initial velocity (0 mi/h) and her final velocity (18.0 mi/h).
Average velocity = (Initial velocity + Final velocity) / 2
Average velocity = (0 mi/h + 18.0 mi/h) / 2
Average velocity = 18.0 mi/h / 2
Average velocity = 9.0 mi/h
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a
A tennis ball is hit vertically
upward with a velocity of 30 ms-1.
It takes 3 s to reach the highest
point. Calculate the maximum
height reached by the ball. How
long it will take to return to
ground?
h=vot-1/2gt²
h=30 x 3 - 1/2 x 9.8 x 3²
h = 45.9 m
t = 2to
t = 2 x 3 = 6s
an object of mass 5 kg is raised above the ground calculate work done on the object.
Answer:
work done on the body is the product of the 3 quantities provided
mass in kilogram, macceleration due to gravity in meters per seconds, gdistance or height in meters, hExplanation:
Raising the object, the work done will be the potential energy.
potential energy equals mgh.
Get the remaining quantities and multiply it out g is usually 10m/s
What is the power in watts of a 6-A
appliance designed to operate on a 120-V circuit?
Answer:
720W
Explanation:
PLEASE MARK ME AS BRAINLIEST AND HAVE A NICE DAY
Which of the following Illustrates 2 resistors in a series circult? A, B, C, D.
Answer:
It's either B or D, I'm not positive which it is
Explanation:
Answer:
The answer is B.
Explanation:
The two resistors are in the same square space, while the others are not.
The law of motion that states that if one object exerts a force on another object, the other object exerts an equal force back on the first object is
A. Newton's second law.
B. Newton's third law.
C. Newton's first law.
D. Newton's law of inertia
Answer:
B
Explanation:
For every action,there is an equal but opposite reaction.
An object is moving to the left
at a constant speed. Its
acceleration is:
A. Positive
B. Negative
C. Zero
ghghghghghg gh gh gh gh gh gh
Answer:
Explanation:
this is a wste of time and question people realy want to learn in this page.
Why does the Law of Conservation of Matter/Mass/Energy support climate change research?
A. The energy we use constantly being destroyed.
B. The energy we use is created every time we use electricity
C. The energy we use cycles throughout our world, always balanced, creating a stable climate.
D. The energy we use is released into the atmosphere, creating loop of continual absorption and releasing of heat
The law of conservation of energy supports climate change research because the energy we use is released into the atmosphere, creating loop of continual absorption and releasing of heat.
Law of conservation of energyThe law states that energy can neither be created nor destroyed but can always be converted from one form to another.
In light of this, any energy used by humans or natural processes is not destroyed. Instead, they are converted into another form or released into the atmosphere.
In the atmosphere, absorption and release of heat energy by greenhouse gases and irradiation create a loop. This loop causes a net heating or cooling of the planet, a phenomenon that affects the climate.
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How does the electric force between two charged particles change if the
distance between them is reduced by a factor of 2?
A. It is reduced by a factor of 4.
B. It is reduced by a factor of 2.
C. It is increased by a factor of 4.
ОО
D. It is increased by a factor of 2.
Answer:
D
Explanation:
If the distance is reduced by factor of 2, lets say the distance was 10cm
reducing by a factor of 2 will leave the distance at 5cm
so the electric force increases by a factor of 2
Does anyone know how to find the mass of one piece of paper , printing paper to be exact
which of the following is a true statement about the physical characteristics of the sun.
Answer:
The sun's interior is similar to the Earth's; it has a core, mantle, and crust
During Taylor's second test of a car with a mass of 200 grams, she recorded 11 seconds, 11.4 seconds, and 11.2 seconds for her 3 trials. What would be the mean value she would use to compare with the other cars?
11.53 seconds
33.6 seconds
11.2 seconds
11 seconds
Answer:
C. 11.2 seconds
The mean value of three trials of 11, 11.4 and 11.2 seconds will be 11.2 seconds
What is mean?The mean for any data is defined as the ratio of the sum of all the data to the number of the data.
It is given that
[tex]t_1=11\ \ \ \ \ \ \ \ t_2=11.4 \ \ \ \ \ \ \ \ t_3=11.2[/tex]
Now the mean is given as
[tex]\rm Mean=\dfrac{t_1+t_2+t_3}{N}[/tex]
[tex]\rm Mean=\dfrac{11+11.4+11.2}{3}=11.2 \ Sec[/tex]
Hence the mean value of three trials of 11, 11.4 and 11.2 seconds will be 11.2 seconds
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complete these sentences by crossing out the incorrect words.
The greater the amplitude of a wave, the ( less/more ) energy it is transferring. As waves spread out from a source, the energy they transfer gets more ( concentrated/ spread out ) and so the amplitude of the waves gets ( larger/ smaller)
Answer:
The greater the amplitude of a wave, the ( less/more ) energy it is transferring.
The more energy; so that means less would be the incorrect word
As waves spread out from a source, the energy they transfer gets more ( concentrated/ spread out )
Spread out; so that means concentrated would the be the incorrect word
and so the amplitude of the waves gets ( larger/ smaller)
Smaller; so that means larger is the incorrect word
is paper an insulator or a conductor?
Answer:
Paper is an insulator.
Please mark as brainliest
Answer:
Paper is an insulator because it don't allow heat to pass or flow through them.
Conductor
•Are materials that can transfer heat easily.
•Allowing heat to transfer freely through them.
Ex: cooking pan
silver
metal spoon
nail
Insulator
Are materials that do not allow heat to pass through them.
Ex: rubber
wood
leather
plastic
paper
A tennis ball has a mass of 57 g. A tennis player hits the tennis ball with a tennis racket. The tennis ball has a velocity of 25 m / s when it hits the racket. The velocity of the tennis ball when it leaves the player’s racket is 15 m / s in the opposite direction from its approaching direction. The average force exerted by the tennis racket on the ball is 35 N. For how long is the tennis ball in contact with the tennis racket?
Answer:
0.065 seconds
Explanation:
i) Change in momentum is equal to impulse so, m(v-u) = ft (Where f is force and t is time)
ii) Since we know the mass of the ball, we change grams to the SI unit of kilograms, kg so 0.057kg
iii) We are also told that the ball CHANGES direction, so we know that the new velocity is the negative value of the initial one,
iv) Putting this all together we get 0.057(25--15) which is the same as 0.057(25 + 15)
v) We get an impulse of 2.28 Ns
vi) We take this value and divide it by 35 as we want the Force alone and not the time,
vii) To which we get 0.065 seconds,
Hope this was helpful!!
a rectangular container measuring 20cmX20cmX30cm is filled withn water.What is the mass of the voulme of water in kilogram and in grams?
Answer:
12,000 grams = 12 kg
Explanation:
Volume V = 20 x 20 x 30 cm³ = 12,000 cm³
density of water d = 1 g/cm³
so the mass is 12,000 grams = 12 kg
Using data from the diagram below, calculate the ratio of the height to which water at 0°C and mercury are raised or suppressed by capillary action in the same glass tube (use density and
surface tension values of water that are accurate to at least 3 significant figures for your calculation. Include the appropriate sign with your answer.)
water
mercury
Due to stronger cohesive than adhesive forces mercury levels falls in a capillary tube. However, water level rises in a capillary tube due to greater adhesive than cohesive forces.
What is capillary action?Capillary action refers to the rise or fall of a liquid in a narrow tube.
The height to which a liquid is depressed or rises in a narrow tube depends on the strength of the cohesive forces of the molecules of the fluid compared to the adhesive forces between the molecules of the fluid and the walls of the tube.
In water, the adhesive forces between the walls of the tube and water molecules is greater than the cohesive forces between water molecules, hence water rises in a capillary tube.
In mercury the adhesive forces between the walls of the tube and water molecules is less than the cohesive forces between mercury molecules, hence mercury levels falls in a capillary tube.
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Are amplitude and wavelength related?
A: Yes
B: No
The answer is A.Yes
Explanation:
The amplitude of a wave is the height of a wave as measured from the highest point of the wave to the lowest on the wave.
What are the units for the spring constant k?
Answer:
F=k*x or
k is the spring constant, in Newtons per meter (N/m), and x is the displacement of the spring from its equilibrium position. The spring constant, k, is representative of how stiff the spring is. Stiffer (more difficult to stretch) springs have higher spring constant
Explanation:
Answer:
N/m
Explanation:
Spring force is defined as
F=kx
So,
the terms for spring constant can be rearranged to find
F/x =k
which simplifies to
N/m
since force F is in newtons, and displacement x is in meters.
What game has worst Physics?
Answer:
Cyberpunk has worst Physics
Based on the latitude you estimated, predict how much energy is transferred from the sun to the surface, and then to the air in your city.
A low latitude, the energy transferred from the sun is high while at a high altitude the energy transferred from the sun is low.
Effect of latitude on energy transferred from the sunLatitude is an angle which ranges from 0 degree at the Equator to 90 degrees at the poles of the Earth.
At higher latitudes, the sun's rays are less direct and a lower latitude the ray's of the sun are more direct. The farther an area is from the equator, the lower its temperature.
Thus, a low latitude, the energy transferred from the sun is high while at a high altitude the energy transferred from the sun is low.
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If a capital letter R is seen in an ordinary mirror , what does it look like?
If a capital letter R is seen in an ordinary mirror, it will look like option D. The correct option is D.
What is a mirror?Something that is reversed with respect to a previous instance of the same thing, or with respect to a plane or axis in between. The best illustration of a virtual image is a reflection in a mirror.
Real images are created by intersecting rays, and virtual images are created by diverging rays. A mirror creates a virtual image by reflecting a real image (blue) back to the viewer (red), giving the impression that the items in the image are behind the mirror's surface and facing the other way (purple).
The R in the mirror will look vertically inverse. The types of mirrors are plane mirrors, rotating mirrors, inclined mirrors, and spherical mirrors.
Therefore, the correct option is D.
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A student runs an experiment in which a block of known mass is moving across a horizontal table in an xy-coordinate plane. As the block reaches the origin of the coordinate system, the block explodes into two pieces of masses m1 and m2. During the experiment, the velocity of the block 1.0 second before the explosion and the velocity of the two pieces 1.0 second after the explosion are measured using a motion sensor. Conservation of momentum is applied using the masses of the two pieces. However, when the velocity of the piece of mass m2 is calculated, the measured value is 10% less than the calculated value. Which of the following statements best explains the difference in the calculated and measured velocity?
The statement that best explains this difference is "As the block is moving across the table, friction will affect the block’s motion and thus could account for the difference" (option A).
What is friction?In physics, friction can be defined as a force of resistance that occurs when an objects moves above a surface or above another object. Friction can be classified in four types:
Static friction: This is the type of friction when two objects are in contact agaisnt each other but there is no movement.Sliding friction: This type of friction occurs as one object moves over another.How does friction affect the velocity of the object moving?This force opposes the movement of the object and therefore it can affect the velocity of the object by decreasing it. Based on this, it is likely that the difference in the calculation is because of friction as this was not considered (option A).
Note: This question is incomplete; here is the missing section:
A. As the block is moving across the table, friction will affect the block’s motion and thus could account for the difference.
B. It is possible that a small amount of the original block was lost during the explosion.
C. When the student did the calculation, the student assumed that the explosion occurred just as the block reached the origin. The difference in velocity could be due to the explosion occurring either just before or just after the origin.
D. The explosion created a force that affected the experiment.
E. Conservation of momentum is not the correct equation to apply to the explosion, since the two pieces apply forces to each other.
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Answer:
The difference between the calculated and measured velocity of the piece of mass m2 can be attributed to several factors. Here are a few possible explanations:
1. Measurement error: It's possible that there were errors or inaccuracies in the measurements taken by the motion sensor. This could include issues with the sensor itself, calibration errors, or human error in recording the data.
2. Friction and air resistance: The experiment assumes an ideal scenario where there are no external forces acting on the block and the resulting fragments. However, in reality, there may be friction and air resistance present, which can reduce the velocity of the pieces after the explosion. These factors were not accounted for in the conservation of momentum calculations.
3. Internal forces: The explosion of the block into two pieces involves internal forces between the fragments. These forces may not be completely accounted for in the conservation of momentum analysis. If there are significant internal forces acting during the explosion, they could reduce the calculated velocity of the piece of mass m2 compared to the measured value.
4. Incomplete information: It's possible that there is additional information or factors that were not considered in the given description of the experiment. Without knowing all the details, it's challenging to pinpoint the exact reason for the discrepancy between the calculated and measured velocity.
In summary, the most likely explanation for the difference between the calculated and measured velocity of the piece of mass m2 is measurement error or the presence of external forces (such as friction and air resistance) and internal forces (during the explosion) that were not accounted for in the analysis.
19) Study the chart above. Which statement is TRUE regarding natural and synthetic (manufactured) fibers?
A) Glass is a natural material.
B) Staple fibers do not come from animals.
C) Organic manufactured materials are either synthetic or natural plastics.
D) Synthetic polymers including polyester and nylon, make up a large category of synthetic material.
Answer: The answer is D: Synthetic polymers including polyester and nylon, make up a large category of synthetic material.
Explanation:
Which of the following determines the natural frequency of an object?
A. Color
B. Pressure
C. Length
Answer:
C
Explanation:
The longer an object, the slower it vibrates and since frequency is the number of oscillations an object makes per second, then you can say the longer the object, the lower the frequency, and the inverse is true.
A force is exerted on a box and an equal and opposite force is exerted by the box. What will happen to the box?
Explanation:
The box will undergo an acceleration. Due to Newton's 3rd Law, any action causes an equal and opposite reaction. The equal and opposite force from the box will not cancel the force that you are applying.
Answer:
The box will not move as it is in a a stable condition
Explanation:
when an equal and opposite force acts on a body the effects of forces cancels out. provided the body can withstand the tensile and compressive actions of the forces. when both forces are coming together it leads to compression while tension refers to forces moving away fro, each other.
a story that ends indeed God knows the best
Answer:
In fact, God already knows how your story will end. The thing is, it’s really his story and he created you to be a unique and significant part of it. That’s why you can have faith that he is working to take care of you and to give you a good future. God repeatedly says in Scripture that he will one day reward us for our faith.
Good luck
Explanation:
A uniform disc of inertia 75kgm and the radius of gyration 3m rotates with angular velocity of 2 rads. Determine the mass
Answer:
I= 1/2 mr^2 solve for mass m.
radius given
angular momentum: I*w=I*2
KE= 1/2 I w^2= 1/2 I *2^2
Explanation:
The mass of the uniform disc at the given moment of inertia is determined as 16.67 kg.
Conservation of angular momentumThe mass of the uniform disc is calculated from the moment of inertia of the disc.
I = ¹/₂mr²
2I = mr²
m = (2I)/r²
where;
m is mass of the discI is moment of inertiar is radius of the discm = (2 x 75)/(3²)
m = 16.67 kg
Thus, the mass of the uniform disc at the given moment of inertia is determined as 16.67 kg.
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