if you warm a 35-kg pile of sand from 300° c to 350 °c and the specific heat of sand is 664 0/(kg
what is the change in thermal energy?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

A-of 75 cm by cm by 17.5 cm up. of is 2 kg a , in ,if it is in , kg/?

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2