Test_2_B - PHYS 2425 - Dr. Honan - Test 2 - B Possibly...

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PHYS 2425 - Dr. Honan - Test 2 - B Name _______________ Possibly Useful Information: g = 9.80m/s 2 Problem 1 Short answer (2 points each) A car brakes while rolling down a hill in neutral with an increasing speed. Specify whether the following quantities are positive, negative or zero. (Answer positive, negative or zero.) ________ [i] Δ K ________ [ii] Δ U ________ [iii] Δ U + Δ K Problem 2 Short answer (4 points each) ______ [i] The coefficients of kinetic and static friction between a 1000 lb refrigerator and the floor are 0.55 and 0.65 . If when at rest the refrigerator is pushed with a horizontal force of 600 lb then what is the force of friction between the refrigerator and floor? (a) 500 lbs (b) 550 lbs (c) 600 lbs (d) 650 lbs (e) 1000 lbs (f) 1200 lbs (g) none of the above ______ [ii] A 1200 lb weight is held the pulley arrangement shown. If all the pulleys are ideal, then what is the force of the rope pulling up on the floor? (a) 200 lbs
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Test_2_B - PHYS 2425 - Dr. Honan - Test 2 - B Possibly...

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