Not sure if 1 is correct and how to do number 2. A sphere of mass m_1 and a bloc

Question

Not sure if 1 is correct and how to do number 2.

A sphere of mass m_1 and a block of mass m_2 are connected by a light cord that passes over a pulley as shown in the figure. The radius of the pulley is R, and the mass of the thin rim is M. The spokes of the pulley have negligible mass. The block slides on a frictionless, horizontal surface. Which of the following is the correct expression for the total angular momentum of the system? a. L = m_1vR +m_2vR + MvR b. L = - m_1vR - m_2vR -MvR c. m_1vR +m_2vR + 1/2MvR d. L= -m_1vR + m_2vR+ 1/2MvR This is the position vs. time graph of a mass on a spring. What can you say about the velocity and the net force at the instant indicated by the dotted line? a) Velocity positive; force towards +x b) Velocity negative; force towards -x c) Velocity zero; force towards -x d) Velocity zero; force towards +x e) Velocity negative; force zero

Explanation / Answer

1) a. L = m1vR + m2vR + MvR

Expression for total angular momentum.

where. m1 is the mass of sphere

m2 is the mass of block

M is the mass of rim

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