ex2fl06asolution

ex2fl06asolution - Common Exam 2 Physics 111 Fall 2006 Name...

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Common Exam 2 Physics 111 Fall 2006 Name _____________________________ A Total Number of Points is 15 (Multiple Choice and Workout Problems). Multiple Choice Problems are 1 Point per Question. 1.) A toy car moving at constant speed completes one lap around a circular track (a distance of 200 m) in 25.0 s. If the mass of the car is 1.50 kg, what is the magnitude of the force that keeps it in a circle? A) 0.48 N B) 1.51 N C) 3.02 N D) 12.0 N E) 96.0 N 2.) The coefficient of static friction is 0.800 between the soles of a sprinter’s running shoes and the level track on which she is running. Determine the maximum acceleration that she can achieve. A) 0.80 m/s 2 B) 7.84 m/s 2 C) 9.80 m/s 2 D) 12.3 m/s 2 E) 38.7 m/s 2 3.) A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed v i = 2.00 m/s. The coefficient of kinetic friction between the sled and the ice is μ k = 0.100. Utilizing energy considerations, find the distance the sled moves before it stops. A) 0.20 m B) 0.98 m C) 2.04 m D) 4.08 m E) 20.0 m Page 1 ( 29 2 2 2 / / 2 2 3.02 N l t v F ma m m r l l m t π = = = = = net, net, 2 0 7.84 m/s y y x x x s s x s F ma N mg F ma ma N mg a g μ = = = = = - = - = = mec th th 2 2 2 2 0 0 1 1 1 0 2 2 2 2.04 m 2 f i k i k i k E E K E mv mv f d mv mgd v d g + ∆ = + ∆ = - + = = = =
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Common Exam 2 Physics 111 Fall 2006 Name _____________________________ A 4.)
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ex2fl06asolution - Common Exam 2 Physics 111 Fall 2006 Name...

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