What is free fall acceleration?
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Explain the difference between photodiode & photocell?
What is sonar?
When gravity is the only force acting on an object the object is in what?
If the distance separating two charges is doubled, the force between them decreases by what multiple factor?
State 'law of machines'?
Explain the thermal transformation?
Why dies a piece of iron sink in water, while a ship remains floating ?
Why the objects which ate perfect reflectors or transparent, not so easily visible ?
Explain why are metals able to conduct current so well?
why we need complex no. in physical world?
Why is a ship loaded with a ballast(bottom load) ?
Explain heat treatment. Why and how is it done?