If 1.5 kilograms of water is to be heated from 20.0°C to 75°C to make a cup of tea, how much heat must be added? The specific heat of water is 4.18 J/kg°C. *

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

The amount of potential energy possessed by an elevated object is equal to what?