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# T1a4p - Assignment 4 Problems(Fall Term Physics 102 37 A...

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37. A 1000-N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an angle of 20.0° below the horizontal as shown in Figure P4.37a. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 300-N force is instead pulling the block at an angle of 20.0° above the horizontal as shown in Figure P4.37b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as found in (a). Figure P4.37 µ k = .256, a = .509 m/s 2 41. The coefficient of static friction between the 3.00-kg crate and the 35.0° incline of Figure P4.41 is 0.300. What mini-mum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline? F IGURE P4.41 F = 32.1 N 58. (a) What is the minimum force of friction required to hold the system of Figure P4.58 in equilibrium? (b) What coefficient of static friction between the 100-N block and the table ensures equilibrium? (c) If the coefficient of kinetic friction between the 100-N block and the table is 0.250, what hanging weight should replace the 50.0-N
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