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A playground merry-go-round, made in the shape of a solid disk, hasa diameter of 2.50 m and a mass of 350.0 kg. Two children, each ofmass 30.0 kg, sit on opposite sides at the edge of the platform.Approximate the children as point masses.
(a) What torque is required to bring the merry-go-round from rest to 25 rpm in 20.0 s?
(b) If two other bigger children are going to push on themerry-go-round rim to produce this acceleration, with what forcemagnitude must each child push? (You may assume that the biggerchildren are standing beside the merry-go-round and pushing on ittangentially.)
The magnetic field of an electromagnetic wave in a vacuum is B_ z = ( 4.0mu T )sin( 1.0×107 x - 2 pi f t) , where x is in m and t is in s. what is the wave's electric field amplitude
A projectile of mass 0.702 kg is shot straight up with an initial speed of 16.1 m/s. How high would it go if there were no air resistance
A ball is thrown upward from a platform 4.0 m high with a speed of 23 m/s at an angle of 37 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
Ball A has a mass of 0.90 kg and moves with an initial speed of 10.60 m/s. It collides with stationary balls B and C, whose centers are on a line vertical to the initial velocity of ball A and that are initially in contact with one-another.
A 2kg box slides along a frictionless surface with a speed of 15m/s and approaches a horizontal spring with a spring constant of 2000N/m. If one end is fixed, a) How far will the spring compress in stopping the box? b) How far will the spring be comp..
A farmer throws a sack of wheat vertically downward with an initial speed of 12 m/s from the roof of a mill, 30.0 m above the ground. What is the speed of the sack at impact
A simple pendulum is 0.50m long. At t=0 it is released from rest starting at an angle of 10 degrees.Ignoring friction, what will be the angular position of the pendulum
An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. what is the final speed of the plane
A bungee jumper with mass 63 jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 47. He finally comes to rest 21.00 below the level of the bridge.
Capacitors won't hold a charge indefinitely; as time goes on, charge gradually migrates from the positive to the negative plate. What is the leakage resistance
A 0.401 kg bead can slide on a curved wire, If the wire is frictionless and the bead is released with an initial speed of 12.8 m/s in the forward direction then find the speed of the bead at B
A horizontal plank 4.00 m long and having mass 20.0 kg rests on two pivots, Find the magnitude of the force exerted on the plank by the second pivot
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