Practice_exam3

# Practice_exam3 - Practice questions for EXAM III 1 Two...

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Practice questions for EXAM III 1. Two pucks are pushed along an air hockey board Finish (which is frictionless). Puck A has three times the mass of puck B. Each puck is pushed for the same distance from the start line to the finish line with the same amount of force. Consider the motion of the pucks at the finish line. Start Which of the following statements is true? A 3m m B F F A) The momentum of the pucks is not equal but the kinetic energy of the pucks is equal B) The momentum and kinetic energy of the pucks are equal C) The momentum of the pucks is equal but the kinetic energy of the pucks is not equal D) The time it takes to push the pucks from the start to the finish line is the same for A and B E) Neither the momentum not the kinetic energy of the pucks are equal 2) A horizontal force is applied to a 4.0 kg box. The box starts from rest moves a horizontal distance of 8.0 meters and obtains a velocity of 6.0 m/s. The system is frictionless. The horizontal force is, a) 3 N b) 5 N c) 7 N d) 9 N e) 11 N 3) A horizontal force of 12 Newtons is applied to a 4.0 kg box that slides on a horizontal surface. The box starts from rest moves a horizontal distance of 10 meters and obtains a velocity of 5.0 m/s. The surface has friction. The friction force is, a) 7.0 N b) 6.5 N c) 6.0 N d) 5.7 N e) 4.9 N 4) A spring-powered dart gun is un-stretched and has a spring constant 12.0 N/m. The spring is compressed by 8.0 cm and a 5.0 gram projectile is placed in the gun. The velocity of the projectile when it is shot from the gun is, a) 1.52 m/s b) 2.54 m/s

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c) 3.92 m/s d) 4.24 m/s e) 5.02 m/s 5) A 2000 kg car accelerates up to a velocity of 40 m/s in 5.0 seconds. The brakes are applied and the car is brought to a stop. The work done by the friction in the brakes is, a) 1.0 x 10 6 J b) 1.2 x 10 6 J c) 1.6 x 10 6 J d) 2.1 x 10 6 J e) 2.5 x 10 6 J 6) A car traveling at 30 mph skids to a stop in 60 meters. If a car travels at 60 mph with the same skid conditions, then what is distance the car skids to come to a stop? a) 340 m
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## This note was uploaded on 02/08/2011 for the course ART 101 taught by Professor Helm during the Spring '11 term at DeVry Austin.

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Practice_exam3 - Practice questions for EXAM III 1 Two...

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