20) A heavy rock and a light rock are dropped from the same height and experience no
signific...
Physics, 27.02.2020 02:46 tracitalbot
20) A heavy rock and a light rock are dropped from the same height and experience no
significant air resistance as they fall. Which of the following statements about these rocks are correct? (There could be more than one correct choice.)
A) Both rocks have the same kinetic energy when they reach the ground.
B) Both rocks have the same speed when they reach the ground.
C) The heavier rock reaches the ground before the lighter rock.
D) Just as they were released, both rocks had the same amount of gravitational potential energy.
E) When they reach the ground, the heavier rock has more kinetic energy than the lighter rock.
Answers: 1
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Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.
Answers: 2
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