What are the assumptions made during the oil drop experiment?
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State a reason why heat transfer by radiation is faster than by conduction.
Explain why a piece of solid steel weighing a few grams sinks in water but a ship weighing thousands of kilograms can float.
Why can a magnet be used as a compass?
An astronaut in orbit around the earth may feel weightless even when the earth’s gravitational field still acts on him. Explain
Why is efficiency of a machine is always less than 100% ?