2.0 kgpush45°Problem 4: (a) The 2 kg wood box in the Figure above on the left slides up a vertical wood wall whileyou push on it at a 45° angle. The coefficient of kinetic friction for wood on wood is Hk = 0.2. Whatmagnitude force Fpush should you apply to cause the box to slide up at a constant speed? Recall thatconstant speed means a = 0 m/sec?. Answer: 34.6 N.(b) Let's re-do part (a), but with the box now sliding down the vertical wood wall while you push on itat a 45° angle. Hk is still Hk = 0.2. What magnitude force Fpush should you apply to cause the box to slidedown at a constant speed? Recall that constant speed means a = 0 m/sec?. Answer: 23.1 N.Problem 5: The Figure shows two blocks connected by a cord (of negligible mass) that passes over africtionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. One blockhas mass mi = 1.3 kg; the other has mass m2 = 2.8 kg. What are: (a) The magnitude of the blocks'acceleration. Answer: 3.6 m/sec?. (b) The tension in the cord? Answer: 17.4 N.Problem 6: A box with mass m = 10 kg moves on a ramp that is inclined at an angle of 0 = 55° abovethe horizontal. The coefficient of kinetic friction between the box and the ramp surface is 4 = 0.3.(a) Calculate the magnitude of the acceleration of the box if you push it down the ramp with a constantforce F = 120 N that is parallel to the ramp surface, as shown in the left in the figure below.Answer: 18.3 m/sec?.(b) Calculate the magnitude of the acceleration of the box if you push it up the ramp with a constant forceF = 120 N that is parallel to the ramp surface, as shown in the right in the figure below.Answer: 2.3 m/sec?.FmmF

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2.0 kg push 45° Problem 4: (a) The 2 kg wood box in the Figure above on the left slides up a vertical wood wall while you push on it at a 45° angle. The coefficient of kinetic friction for wood on wood is = 0.2. What magnitude force Fpush should you apply to cause the box to slide up at a constant speed? Recall that constant speed means a = 0 m/sec2. Answer: 34.6 N.

2.0 kg push 45° Problem 4: (a) The 2 kg wood box in the Figure above on the left slides up a vertical wood wall while you push on it at a 45° angle. The coefficient of kinetic friction for wood on wood is = 0.2. What magnitude force Fpush should you apply to cause the box to slide up at a constant speed? Recall that constant speed means a = 0 m/sec2. Answer: 34.6 N.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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