A student who weighs 500 newtons climbed the stairs from the first floor to the third floor,15 meters above, in 20 seconds. How much work did she do

Answers

Answer 1

Answer: Well, the 20 seconds gives us enough information to actually calculate the power she has on her feet :)
Well, the work is 500*15=7500J, that is 7.5 kJ or about 18 calories (1 cal is 418J?) The power is that 7.5 kJ divided by 20 seconds: 375W. That's... OK, I suppose...

Answer 2

Answer:

Answer:

Work = (500N)(15m)=7500J Power= (7500J)/(20s) =375 W

Hopefully this helps

Explanation:

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Which of these follows from Newton's laws about the energy of a moving object? A)The total mechanical energy of an object is always constant. B)The kinetic energy of an object remains the same if friction is absent. C)The mechanical energy remains the same if there are only conservative forces acting. D)The total of all forms of energy is always constant.

Answers

The correct answer for the question that is being presented above is this one: "C)The mechanical energy remains the same if there are only conservative forces acting." The statement that shows that Newton's laws about the energy of a moving object is that the mechanical energy remains the same if there are only conservative forces acting.

_____________ was a popular technique used by animator, Tim Burton. With this animation technique, objects/puppets are made by the artist, and each time they are moved, the artist photographs them instead of drawing them.a. Cel animation
c. Projecting animation
b. Computer Generated Imagery
d. Stop motion animation

Answers

The correct answer is D. stop motion animation. It's called stop motion because you make an illusion of a motion by moving and stopping the characters and then reshooting. This is pretty common but takes a lot of time so not many people choose to do it. It also takes great skill to do it, not just patience.

Stop motion animation is the popular technique that is used by animator, where objects/puppets are made by the artist, and each time they are moved.

What is animation?

Animation can be regarded as a method whereby figures are been manipulated so as to appear as moving images.

One of the notable type of animation is Stop motion animation where the artist photographs the figure instead of drawing them.

Learn more about animation at;

brainly.com/question/25109803

10. Which of the following statements is accurate?A. Sound waves passing through the air will do so as transverse waves, which vibrate vertically and still retain their horizontal
positions.
B. Compressions and rarefactions occur throughout a transverse wave.
C. The wavelength of both traverse and longitudinal waves is measured parallel to the direction of the travel of the wave.
D. Amplitude of longitudinal waves is measured at right angles to the direction of the travel of the wave and represents the
maximum distance the molecule has moved from its normal position.

Answers

Before coming into conclusion first we have to understand the nature of longitudinal wave and transverse wave.

The longitudinal wave is a type of mechanical wave in which the direction of wave propagation is parallel to the particle vibration.In such type of wave one will notice compressions and rarefactions.

Compressions are the high pressure zones where the particles are very close to each other and rarefactions are the low pressure regions where there is large separation between particles. Hence a longitudinal wave is a series of compresions and rarefactions.

The wavelength of a longitudinal wave is the distance between two successive compressions or rarefactions. Hence the wavelength is measured parallel to the direction of wave. As the particle vibration is parallel to wave propagation ,so the amplitude of the wave is measured parallel to wave direction.

Transverse wave is such type of mechanical wave in which the particle vibration is perpendicular to wave propagation.Here crests and troughs are formed.

The distance between two successive crests or troughs are called wavelength which is measured parallel to the wave propagation. As the particle vibration is perpendicular to wave propagation,so the amplitude of the wave is measured perpendicular to the wave propagation.It is so because amplitude of the wave is the maximum distance travelled by the particle from equilibrium position.

Out of the four options given in the question only the option 3 is correct .Other options are wrong as violate the nature of longitudinal and transverse waves.

Answer:

C. The wavelength of both traverse and longitudinal waves is measured parallel to the direction of the travel of the wave.

Explanation:

What 3 factors helped Salva survive in a long walk to water?