A20.0 kg block of ice is sitting in a cooler. the temperature of the ice is 0.0ºc when it is put into the cooler. as it melts, how much heat does the block of ice absorb? (remember hf of water is 3.34 x 105 j/kg) a. 8.68 x 104 j c. 2.36 x 104 j b. 6.68 x 106 j d. 3.68 x 106 j

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e