Chapter 6: Q23P (page 277)
A jar of honey with a mass of 0.5 kgis nudged off the kitchen counter and falls 1 mto the floor. What force acts on the jar during its fall? How much work is done by this force?
Chapter 6: Q23P (page 277)
A jar of honey with a mass of 0.5 kgis nudged off the kitchen counter and falls 1 mto the floor. What force acts on the jar during its fall? How much work is done by this force?
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Get started for freeA runner whose mass is runs in the direction at a speed of . (a) What is the kinetic energy of the runner? (b) Runner turns around and runs in thedirection at the same speed. Now what is the kinetic energy of the runner?
The point of this question is to compare rest energy and kinetic energy at high speeds. An alpha particle (a helium nucleus) is moving at a speed of times the speed of light. Its mass is (a) what is its rest energy? (b) Is it okay to calculate its kinetic energy using the expression?(c) What is its kinetic energy? (d) Which is true? A. the kinetic energy is approximately equal to the rest energy. B. The kinetic energy is much bigger than the rest energy. C. The kinetic energy is much smaller than the rest energy.
In the preceding example, at the final speed, 0.9997 c, what was the particle energy as a multiple of the rest energy ? (That is, if it was twice , write .) What was the kinetic energy as a multiple of? Was the kinetic energy large or small compared to the rest energy? At low speeds, is the kinetic energy large or small compared to the rest energy?
This problem is closely related to the spectacular impact of the comet Shoemaker-Levy with Jupiter in July 1994:
http://www.jpl.nasa.gov/sl9/ sl9.html
A rock far outside our solar system is initially moving very slowly relative to the Sun, in the plane of Jupiter’s orbit around the Sun. The rock falls towards the Sun, but on its way to the Sun it collides with Jupiter. Calculate the rock’s speed just before colliding with Jupiter. Explain your calculation and any approximations that you make.
,
Distance, Sun to Jupiter
Radius of Jupiter
A boat is coasting toward a dock you're standing on, and as it comes toward you, you push back on it with a force of 300 N. As you do this, you back up a distance of 2m. How much work do you do on the boat?
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