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2048_Spring08_Exam2

# 2048_Spring08_Exam2 - 77777 Instructor(s Field/Hirschfeld...

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77777 77777 1. A 8000-N car is traveling at 12 m/s along a horizontal road when the brakes are applied. The car skids to a stop in 4.0 s. How much kinetic energy does the car lose in this time? (1) 5 . 9 × 10 4 J (2) 4 . 8 × 10 4 J (3) 1 . 2 × 10 5 J (4) 5 . 8 × 10 5 J (5) 4 . 8 × 10 6 J 2. An object is constrained by a cord to move in a circular path of radius 0.5m on a horizontal frictionless surface. The cord will break if its tension exceeds 16N. The maximum kinetic energy of the object can have is: (1) 4 J (2) 8 J (3) 16 J (4) 32 J (5) 64 J 3. A 0.50-kg object moves in a horizontal circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. The work done by the external force as the mass makes
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2048_Spring08_Exam2 - 77777 Instructor(s Field/Hirschfeld...

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