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# Exam3Sol - A 19.0o o 3.25kg 0.500m 22.0 3.00m 3.00m o 65.0...

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3.25kg 65.0 o 25.0 o 13.0m 2.10N A 22.0 o 7.00kg 68.0 o 68.0 o 112.0 o Origin 19.0 o 3.00m n f k mg 0.500m 3.00m L Wper Wpl Principles of Physics I PHYS 2211-160 Exam #3 Chapters 11 - 14 Spring 2010 Name___ Solutions ______________ You may use the constants G = 6.67x10 -11 N m 2 / kg 2 . 1. (5 points) Two students of mass 75.0kg are sitting on opposite sides of the room 5.00m apart (center-to- center). What is the magnitude of the gravitational force that one exerts on the other? a) 2.00x10 -10 N b) 1.00x10 -9 N With F = (6.67x10 -11 N m 2 /kg 2 ) (75.0kg) (75.0kg) / (5.00m) 2 = c) 1.50x10 -8 N d) 7.50x10 -8 N F = 1.50x10 -8 N e) 735N f) 1470N 2. (5 points) When a mass of 725grams is placed on a vertical spring, the spring’s new equilibrium position is 26.5cm below its unloaded equilibrium position. What is the spring constant of the spring in SI units? a) 0.0373 b) 0.192 With F = -kx , k = - F / x = - (-mg) / x = c) 0.366 d) 1.88 k = (0.725kg) (9.80m/s 2 ) / (0.265m) = 26.8 N/m e) 2.74 f) 26.8 3. (5 points) A 2.00kg mass is at the point x = 3.00m , a 5.00kg mass is at the point x = 10.00m .

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Exam3Sol - A 19.0o o 3.25kg 0.500m 22.0 3.00m 3.00m o 65.0...

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