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M4 Physics Test – Retake1. A solid ball of mass 2.5 kg and radius 0.35 m starts at rest at the top of a 45 m high ramp. If

the ball rolls down the ramp without slipping, what will be its angular velocity when it reaches the bottom?

2. A sign is held in equilibrium as shown in the diagram below. If the sign has a mass of 12.5 kg, finda) the tension T in the ropeb) the reaction force F from the wall

3. A wheel of radius 0.95 m and mass 2.40 kg has a force of 27.0 N applied tangentially to its edge. What torque is applied to the wheel?

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4. A 6.0 m long seesaw has its axis of rotation in the middle and two children sitting on it. The first child is 45 kg and sits 1.8 m from the left hand edge while the second child is 34 kg and sits 1.2 m from the right hand edge. Where must an 8.0 kg dog sit to balance the see saw?

5. Two window washers are cleaning a window as in the picture below. If the left window washer is 82.0 kg and the right is 93.5 kg, the bucket is 5.0 kg and the platform itself is 25.0 kg, find the tension in the two ropes holding up the platform.

6. A solid disk of mass 24.5 kg and a radius of 0.85 m begins turning from rest when a force of 112 N is applied tangentially to its edge. Find the kinetic energy of the disk after it has made 119 complete revolutions. (I = 1/2 mr2)