A block of mass m sliding on a frictionless table is attached to a string that p
ID: 1397273 • Letter: A
Question
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 with speed v0 in a circle of radius r0. (Use any variable or symbol stated above as necessary.)
(a) Find the angular momentum of the block.
L0 = __________
(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 = ___________
Explanation / Answer
A)
the angular momentum Lo = r X p
Lo = r X mvo
Lo = m(r X vo )
B)
Ko = 1/2 mvo2
C)
T = mg
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