final_04fall

# final_04fall - Name ID Last Section First Problem 1 A 4kg...

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Name: ID# Section # Last First Problem 1 A 4kg cat (treat it as a point particle) sits on a horizontal floor eyeing a stationary chair of mass 10kg which is a horizontal distance of 1.3m away. The seat of the chair is 0.5m above the floor. The cat jumps up and lands on the seat of the chair just as she reaches the maximum height of her trajectory. She puts out her claws and hangs on. If the chair sits on a part of the floor which has just been waxed, is very slippery and therefore frictionless, what is the momentum of the cat plus chair system just after the cat has landed?

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Name: ID# Section # Last First Problem 2 The sketch shows a mass, m=3kg, on an inclined plane which is at an angle of 40 o to the horizontal. It is attached to a light string which runs over a frictionless, massless pulley and supports a mass M hanging vertically. The coefficients of friction, static and kinetic, between the mass m and the plane are µ s =0.4 and µ k =0.3. (a) If M=5kg, what is the acceleration of the system (magnitude and direction)? (Caution: make sure your frictional force is pointing in the right direction.) (b) What is the range of possible values of M such that the system is at rest in equilibrium? m M 40 o
Name: ID# Section # Last First Problem 2 You perform a circus act where you swing from a 15m high platform on a light inextensible rope. When you reach the ground you collide with and pick up your daughter and then you swing up together to a trapeze 7m above the ground. Your mass is 80kg and your daughter’s is 50kg. You used to pick her up as she stood on the ground

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final_04fall - Name ID Last Section First Problem 1 A 4kg...

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