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Chapter 6: Q57P (page 144)
A puck of mass slides in a circle of radiuson a frictionless table while attached to a hanging cylinder of massby means of a cord that extends through a hole in the table (Fig. 6-43). What speed keeps the cylinder at rest?
The speed that keeps the cylinder at rest is .
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A boat is traveling at when its engine is shut off. The magnitude of the frictional force between boat and water is proportional to the speed v of the boat:where
is in meters per second andis in Newton. Find the time required for the boat to slow to.
A circular curve of highway is designed for traffic moving at 60 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 150 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the minimum coefficient of friction between tires and road that would keep traffic from skidding out of the turn when traveling at60 km/h?
A block is pushed across a floor by a constant force that is applied at downward angle (Fig. 6-19). Figure 6-36 gives the acceleration magnitude a versus a range of values for the coefficient of kinetic friction between block and floor: , , .What is the value of ?
In Fig. 6-59, block 1 of massand block 2 of massare connected by a string of negligible mass. Block 2 is pushed by force of magnitude 20 Nand angle. The coefficient of kinetic friction between each block and the horizontal surface is 0.20. What is the tension in the string?
A bolt is threaded onto one end of a thin horizontal rod, and the rod is then rotated horizontally about its other end. An engineer monitors the motion by flashing a strobe lamp onto the rod and bolt, adjusting the strobe rate until the bolt appears to be in the same eight places during each full rotation of the rod (Fig. 6-42). The strobe rate isflashes per second; the bolt has massand is at radius. What is the magnitude of the force on the bolt from the rod?
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