The figure shows a thin rod, of length L = 1.30 m and negligible mass, that can

Question

The figure shows a thin rod, of length L = 1.30 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 140 kg is attached to the other end. The rod is pulled aside to angle ?0 = 15

The figure shows a thin rod, of length L = 1.30 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 140 kg is attached to the other end. The rod is pulled aside to angle ?0 = 15° and released with initial velocity = 0. (a) What is the speed of the ball at the lowest point? (b) Does the speed increase, decrease, or remain the same if the mass is increased?

Explanation / Answer

1) v = sqrt(2gh)

h = L(1-cos?)

h=1.30(1-cos15)

h=0.0455m

v=sqrt(2gh)

=sqrt(2*9.8*0.0455)

v=0.944m/sec

b)speed does not depend on mass

so it will reamin same

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