BackA 250 g ball is launched with a speed of 35 m/s at a 30° angle. A strong headwind exerts a constant horizontal drag force on the ball. What is the magnitude of the drag force if the wind reduces the ball's travel distance by 20%?
A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic friction between the skier's skis and the water surface is μₖ = 0.25 (Fig. 5–59). What is the skier's acceleration if the rope pulling the skier behind the boat applies a horizontal tension force of magnitude FT = 240N to the skier (θ = 0°)?
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A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic friction between the skier's skis and the water surface is μₖ = 0.25 (Fig. 5–59). What is the skier's horizontal acceleration if the rope pulling the skier exerts a force of FT = 240N on the skier at an upward angle θ = 12°?
A package of mass m is dropped vertically onto a horizontal conveyor belt whose speed is v = 1.5m/s, and the coefficient of kinetic friction between the package and the belt is μk = 0.70. For how much time does the package slide on the belt (until it is at rest relative to the belt)?
(II) A package of mass m is dropped vertically onto a horizontal conveyor belt whose speed is v = 1.5m/s, and the coefficient of kinetic friction between the package and the belt is μk = 0.70. How far does the package move during this time?
A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic friction between the skier's skis and the water surface is μₖ = 0.25 (Fig. 5–59). Explain why the skier's acceleration in part (b) is greater than that in part (a).