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Question
A running back with a mass of 90 kg and a speed of 5 m/s collides with, and is held by, a 135-kg defensive tackle going in the opposite direction. How fast must the tackle be going before the collision for their speed afterward to be zero?
Question
A pitcher throws a 0.60 kg ball of clay at a 5.0 kg block of wood. The clay sticks to the wood on impact, and their joint velocity afterward is 1.3 m/s. What was the original speed of the clay (in m/s)?
Question
An empty storage tank has a volume of 3,720 ft3. What is the buoyant force exerted on it by the air? (Assume the air is at 0°C and 1 atm.)
Question
An ebony log with volume 18.4 ft3 is submerged in water. What is the buoyant force on it (in lb)? (Enter the magnitude.)
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