Please answer these questions at your earliest convenience. These questions are based on dynamics topics in physics.
8. It was found that a 1000 kg car goes down a 0.05 slope, without an engine and without a brake, at 40 mph. How much useful power should the engine deliver to go up the same road, at the same speed? In horsepower, please.
9. You make a 0.5 cm in diameter hole at the bottom of a McDonald's large-size drink. How long will it take for the water to pour out, roughly? Both approximate theory and experiment, please.
10. You put a 4 lb brick on an 800 ft/min conveyor belt. How much work does the belt do?