review-exam3-solutions - Review Exam 3 Physics 2750 1. A...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Review Exam 3 Physics 2750 1. A puck on a frictionless air hockey table has a mass of 5.0 g and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The cord is then pulled from below, shortening the radius to 1.0 m. Calculate the new angular velocity (in rad/s) of the puck. 2. A uniform 100‐kg beam is held in a vertical position by a pin at its lower end and a cable at its upper end. A horizontal force (magnitude P) acts as shown in the figure. If P = 75 N, what is the tension in the cable? 3. A thin rod of mass M and length L is suspended vertically from one end. A small piece of clay of mass m is thrown at the rod perpendicular to it with a speed v0 and hits the rod at a distance d > L/2 below the point of support. The clay sticks to the rod and the two of them start rotating together. A) Find the angular speed with which the rod + clay system starts rotating. B) Find the maximum height they will reach with respect to the bottom end of the rod. 4. A mass m1 and a mass m2 are suspended by a pulley that has a radius R and mass M. The cord has a negligible mass and causes the pulley to rotate without slipping. The pulley rotates without friction. The masses start from rest a distance d apart. Treating the pulley as a uniform disk with a moment of inertia ½ MR2, determine the speeds of the two masses as they pass each other. 5. Find the work required to move an Earth satellite of mass m from a circular orbit of radius 2RE to one of radius 3RE. 6. At what height above Earth’s surface is the energy required to lift a satellite to that height equal to the kinetic energy required for the satellite to be in orbit at that height? 7. The pulley shown bellow has radius R and moment of inertia I. One end of the mass m is connected to a spring of force constant k, and the other end is fastened to a cord wrapped around the pulley. The pulley axle and the incline are frictionless. If the pulley is wound counterclockwise so that the spring is stretched a distance d from its unstretched position and is then released from rest, find the angular speed of the pulley when the spring is again unstretched. ...
View Full Document

This note was uploaded on 12/05/2010 for the course PHYSCS 2750 taught by Professor Kostzin during the Spring '10 term at Missouri (Mizzou).

Ask a homework question - tutors are online