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

Info icon This 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

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern