Asample of water with mass of 587.00 is heated with 87 kj of energy to a temperature of 518.4 k. the specific heat of water is 1 j-1 kg k-1. what is the initial temperature of the water?

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?