Laws of Motion
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A worker stands still on a roof sloped at an
A worker stands still on a roof sloped at an angle of 36° above the horizontal. He is prevented from slipping by a static frictional force of 390 N....
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A worker drags a crate across a factory floor by pulling on
A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude F = 450N on the rope,...
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A woman weighs 120 lb. Determine (a) her weight
A woman weighs 120 lb. Determine (a) her weight in newtons (N) and (b) her mass in kilograms (kg).
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A window washer pushes his scrub brush
A window washer pushes his scrub brush up a vertical window at constant speed by applying a force F as shown in Fig. 5.65. The brush weighs 12.0 N...
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A window washer pulls herself upward using the bucket-pulley app
A window washer pulls herself upward using the bucket-pulley apparatus shown is Fig. 4.48. (a) How hard must she pull downward to raise herself...
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A weightlifter stands on a bathroom scale. He pumps a
A weightlifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the reading on the bathroom scale as this is done? What if...
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A wedge with mass M rests on a frictionless
A wedge with mass M rests on a frictionless horizontal tabletop. A block with mass m is placed on the wedge and a horizontal force F is applied to...
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A warehouse worker pushes a crate
A warehouse worker pushes a crate along the floor, as shown in Fig. 4.31, with a force of 10 N that points downward at an angle of 450 below the...
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A vertical spring of force constant 600 N/m has one
A vertical spring of force constant 600 N/m has one end attached to the ceiling and the other to a 12- kg block resting on a horizontal surface so...
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A vertical force T is exerted on a 5-kg body
A vertical force T is exerted on a 5-kg body near the surface of the earth, as shown in Figure. Find the acceleration of the body if (a) T = 5 N, (b)...
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