final_practice_questions

final_practice_questions - MC.i exert a normal force but...

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MC.ii) A box of weight 10 N sits on a frictionless surface. It is attached by a massless frictionless rope to a box of weight 20 N. What will the tension in the rope be as they accelerate? a) zero b) 10 N c) less than 20 N, but not necessarily 10 N d) 20 N e) more than 20 N 10 N 20 N MC.v) A car is towing a trailer, but not necessarily at constant velocity. The magnitude of the force that the car exerts on the trailer is equal to the magnitude of the force that … a) the road exerts on the trailer b) the trailer exerts on the road c) the road exerts on the car d) the trailer exerts on the car e) the earth exerts on the trailer MC.i) The box shown to the right is placed against the two supports as shown. If the supports can only exert a normal force but not a friction force, could the box remain stationary? (Where are you using as your pivot point?) a) yes b) no, but it could if the supports could have friction c) no, even if the supports could have friction MC.iv) The object shown to the right consists of three point masses (enlarged for clarity). What is the moment of inertia of the object if it rotates around the middle mass? a) 3 kg m 2 b) 4 kg m 2 c) 6 kg m 2 d) 8 kg m 2 e) 10 kg m 2 2 kg 1 kg 1 kg 1 m 2 m MC.iii) A refrigerator with a weight of 500 N sits on a floor. The coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.40. A force of 250 N is applied horizontally to the refrigerator. What is the magnitude of the friction force on the refrigerator? (Does the refrigerator move?) a) 0 N b) 150 N c) 200 N d) 250 N e) 500 N
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MC.vi)
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final_practice_questions - MC.i exert a normal force but...

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