A small ball of clay of mass m hangs from a string of length L (the other end of which is fixed). A seond ball of clay of mass m/3 is to be launched horizontally out of a spring with spring constant k. Once launched, the second ball will collide with and stick to the hanging ball, and they'll follow a circular path around the fixed end of the string.
A) Determine an expression for the distance (change in x) that
the spring should be compressed by, in terms of g and th define
variables, that will allow for the tension in the string to be zero
at the top of the circular motion.
when tension becomes zero, minimum speed at thr top of the loop,
v_top = sqrt(g*L)
minimum speed at the bottom of the loop, v_bottom = ssqrt(5*g*L)
let u is the speed of second ball just before the collision.
Apply conservation of momentum
(m/3)*u = (m/3 + m)*v_bottom
(m/3)*u = (m/3 + m)*sqrt(5*g*L)
u = 4*sqrt(5*g*L)
let x is the comression of the spring and k is the spring constant.
now apply conservation of energy
initial elastic potential energy of the spring = kinetic energy gained by the second ball
(1/2)*k*x^2 = (1/2)*m*u^2
(1/2)*k*x^2 = (1/2)*m*(4*sqrt(5*g*L))^2
k*x^2 = 4*m*5*g*L
x = sqrt(20*m*g*L/k) <<<<<<<------Answer
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