midterm_formA

midterm_formA - Physics 2 Midterm Do not turn this page...

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Physics 2 Midterm Do not turn this page until you are instructed to do so
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Test Form A Enter solutions in the scantron. There is no penalty for wrong answers. Make sure to enter the test form in your scantron Question 1 Imagine a body at rest at height R from the earth’s surface, where R is the radius of the earth. If it falls freely under the gravitational pull of the earth, what will be its velocity just before it hits the earth’s surface where the acceleration due to gravity is g ? Neglect the air resistance (a) v 2 =gR (b) v 2 =gR/2 (c) v 2 =gR/3 (d) v 2 =3gR/2 Question 2 A wheel starts from rest and rotates through 1000 radians in 10 s under the action of a constant torque. If the moment of inertia of the wheel is 4 kg m 2 , the torque acting on the wheel is (a) 10 Nm (b) 20 Nm (c) 40 Nm (d) 80 Nm (e) 100 Nm Question 3 A sign of mass m o is suspended by a system of 3 cords as in the figure at the right. One cord is horizontal, one is vertical and the other makes an angle θ with the horizontal. The tension in these three cords are T 3 , T 1 and T 2 respectively. The tension T
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This note was uploaded on 11/27/2009 for the course PHYS PHYS 2 taught by Professor Campagnari during the Summer '08 term at UCSB.

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midterm_formA - Physics 2 Midterm Do not turn this page...

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