A 2 kg mass rests on a rough plane and is attached to an unstretched
spring with a spring constant of 50 N/m. A 10 kg mass is attached to the
2 kg mass by means of a cord passing over a pulley. The 10 kg mass is
released from point "A" and in falling to point "B" increases its speed
from zero to 1.5 m/s.
(Neglect the mass of the cord and spring in the
following questions.)
Show the reasoning in arriving at your answers to these questions in
your notebook.
Let g = 10 m/s2 .
A.
What is kinetic energy of the 10 kg mass at point "B"?
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Answer.
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B.
What is kinetic energy of the 2 kg mass
when the 10 kg mass reaches point "B"?
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Answer.
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C.
What is the change in gravitational potential energy of the 10 kg mass?
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Answer.
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D.
What is the change in the potential energy of the spring
as the 10 kg mass moves from point "A" to point "B"?
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Answer.
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E.
How much of the system's mechanical energy is converted into heat
as 10 kg mass falls from "A" to "B"?
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Answer.
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F.
What is the average friction force acting on the 2 kg mass?
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Answer.
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