Why can the sun transmit heat to earth only by radiation? . the space between the sun and earth contains almost no matter.. radiation transmits heat through the motion of a gas.. radiation does not require the creation of electromagnetic waves.. the molecules in the sun are moving too fast to cause conduction.

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)