The velocity of souna at 20°C is_____?

Ice is the ____ form of water.

The terminal velocity for a skydiver with an unopened parachute is about?

The mass of the body is different from its weight because___?

The bases of cooking vessels are painted ___ in order to absorb more heat.

Which instrument measures the intensity of earthquake shocks?

_______ is a good nuclear fuel?

A solid metal ball has a spherical cavity. If the ball is heated, the volume of the cavity will_____?

The carbon filament is invented by_____?

To hear a clear echo, the minimum distance should be______?

The centripetal force required for a car or a bicycle to go round a circular curve depends on___?