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# Test_2_A - PHYS 2425 Dr Honan Test 2 A Possibly Useful...

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PHYS 2425 - Dr. Honan - Test 2 - A Name _____________ Possibly Useful Information: g = 9.80m/s 2 Problem 1 Short answer (4 points each) ______ [i] The coefficients of kinetic and static friction between a 1000 lb refrigerator and floor are 0.40 and 0.45 . When at rest the refrigerator is pushed with a horizontal force of 300 lb. What is the force of friction between the refrigerator and floor? (a) 300 lbs (b) 400 lbs (c) 450 lbs (d) 850 lbs (e) 1000 lbs (f) 1300 lbs (g) none of the above ______ [ii] A car drives up a hill at a constant speed. What are the signs of the changes in kinetic energy and potential energy? (a) Δ K > 0, Δ U > 0 (b) Δ K > 0, Δ U = 0 (c) Δ K > 0, Δ U < 0 (d) Δ K = 0, Δ U > 0 (e) Δ K = 0, Δ U = 0 (f) Δ K = 0, Δ U < 0 (g) Δ K < 0, Δ U > 0 (h) Δ K < 0, Δ U = 0 (i) Δ K < 0, Δ U < 0 (j) It cannot be determined. Problem 2 A mass m 1 slides on a horizontal surface with a coefficient of kinetic friction μ k . It is connected by a rope to a hanging mass m 2 over the pulley arrangement shown. What is the downward acceleration of the hanging mass m 2 ?

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