How does antarctic ice regulate our earth's climate?
a. it reflects the sun's heat energy, keeping the earth cool.
b. it absorbs the sun's heat energy, keeping the earth warm.
c. it reflects the sun's heat energy, warming the oceans.
d. it absorbs the sun's heat energy, stalling ocean currents.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

An object in mechanical equilibrium is an object