2048_Spring09_Exam2

# 2048_Spring09_Exam2 - 77777 Instructor(s...

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77777 77777 1. Which of the following has the largest kinetic energy? An object with: (1) Mass 2M and speed 3V (2) Mass 3M and speed V (3) Mass 3M and speed 2V (4) Mass M and speed 4V (5) Mass 40M and speed V/2 2. 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 one revolution is about: (1) 47 J (2) 24 J (3) 59 J (4) 94 J (5) 120 J 3. A particle starts from rest at time t = 0 and moves along the x axis. If the net force on it is proportional to the time t , its kinetic energy is proportional to: (1) t 4 (2) t (3) t 2 (4) 1 /t 2 (5) none of these answers 4. A particle moves through an xyz coordinate system while a force acts on the particle. When the particle has the position
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