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___?