Physics, 04.08.2021 09:40 issaaamiaaa15
A certain projector uses a concave mirror for projecting an object image that is 5 times bigger than the object and the screen is 5m away from the mirror. So calculate the focal length of the mirror??
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An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.
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What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules? a. 75% b. 35% c. 25% d. 85%
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