midterm - Physics 2 Summer 2008 Midterm Enter solutions to...

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Physics 2 – Summer 2008 Midterm Enter solutions to the two problems in the blue book. Each problem is worth 20 points. (2 x 20 = 40). Enter answers to the 15 multiple choice questions in the scantron. The multiple choice questions are worth 60 points, total (40 + 60 = 100) Multiple Choice Question 1 Let A = 2 i + 3 j and B = i - k . C = A x B is given by (a) 2 i (b) 2 i + 3 j – 3 k (c) -3 i + 2 j - 3 k (d) -3 i - 2 j - 3 k (e) none of the above Multiple Choice Question 2 Two 1.0 Kg point masses a distance D apart each exert a gravitational force of magnitude F on the other one. If 1.0 Kg is now added to each mass, the gravitational attraction exerted by each would be (a) F (b) 2F (c) 3F (d) 4F Multiple Choice Question 3 An object weighs 200 N on the earth’s surface. When it is moved to a point three Earth radii above the Earth’s surface, it will weigh (a) 12.5 N (b) 25 N (c) 50 N (d) 67 N (e) 100 N Multiple Choice Question 4 A uniform rod has a weight of 80 N and a length of 1m. It is hinged to a wall (at the left end), and held in a horizontal position by a vertical massless string (at the right end). What is the magnitude of the torque exerted by the string about a horizontal axis which passes through the hinge and is perpendicular to the rod? (a) 5 Nm (b) 10 Nm (c) 20 Nm (d) 40 Nm (e) 80 Nm
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Multiple Choice Question 5 A skater is spinning on ice. When she brings her arms closer to her body, her angular velocity (a) Increases (b) Decreases (c) Stays the same Multiple Choice Question 6
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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 - Physics 2 Summer 2008 Midterm Enter solutions to...

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