Physics 6A Ch9Worksheet

# Physics 6A Ch9Worksheet - d Not enough information is given...

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Physics 6A Ch. 9 – In Class Worksheet 1) An old record player rotates clockwise at 33 1/3 rpm (revolutions per minute). a) What is its angular velocity in rad/s? b) Find the period of a record that is rotating at 45 rpm. 2) To throw a curve ball, a pitcher gives the ball an initial angular speed of 36 rad/s. When the catcher gloves the ball 0.6s later, its angular speed has decreased (due to air resistance) to 34 rad/s. (a) What was the ball’s angular acceleration, assuming it to be constant. (b) How many revolutions did the ball make before being caught? 3) Two identical twins ride on a merry-go-round, with twin A at a greater distance from the axis of rotation than twin B. Which is the most accurate statement? a) The angular speed of twin A is greater than the angular speed of twin B. b) The angular speed of twin A is less than the angular speed of twin B. c) The angular speed of twin A is equal to the angular speed of twin B.
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Unformatted text preview: d) Not enough information is given. 4) Two identical twins ride on a merry-go-round, with twin A at a greater distance from the axis of rotation than twin B. Which is the most accurate statement? a) The kinetic energy of twin A is greater than the kinetic energy of twin B. b) The kinetic energy of twin A is less than the kinetic energy of twin B. c) The kinetic energy of twin A is equal to the kinetic energy of twin B. d) Not enough information is given. 5) Yo-yo man releases a yo-yo from rest and allows it to drop, as he keeps the top end of the string stationary. The mass of the yo-yo is 0.056 kg, its moment of inertia is 2.9 x 10-5 kg m 2 , and the radius, r, of the axle the string wraps around is 0.0064 m. Neglect the mass of the string. What is the linear speed of the yo-yo after it has dropped through a height of 0.50m? www.clas.ucsb.edu/staff/vince r...
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## This note was uploaded on 09/09/2011 for the course PHYS 6a taught by Professor Stanek during the Spring '07 term at UCSB.

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