Flash and thunder are produced simultaneously . but thunder id heard a few second after is seen,why how does the speed of sound in air vary with rise in density of the medium?
give one ex. Where kinetic energy is transferred from one object to others.
Archimedes could find the purity of king's crown using buoyancy. How?
How do u define mechanical work ?
Name and define SI unit of work.
What do you mean positive and negative work ? Give example