Flashlight shines into the tank from above
A cylindrical tank is 50 ft deep, 39.5 ft in diameter, and filled up to the top with water. A flashlight shines into the tank from above. What minimum angle can its beam make with the water surface if the beam is to illuminate part of the bottom?
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A golf ball rolls off a horizontal cliff with an initial speed of 13.6 m/s. The ball falls a vertical distance of 12.0 m into a lake below. What is the speed v of the ball just before it strikes the water?
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