Question

A block of mass m sliding on a frictionless table is attached to a string that passes through a…

A block of mass m sliding on a frictionless table is attached to a string that passes through a narrow hole through the center of the table. The block is sliding withspeed v0 in a circle of radius r0. (Use any variable or symbol stated above as necessary.)
(a) Find the angular momentum of the block.
L=?
(b) Find the kinetic energy of the block.
k0=?
(c) Find the tension in the string.
T=?
(d) A student under the table now slowly pulls the string downward. How much work is required to reduce the radius of the circle from r0 to r0/2?
W=?

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