The nebular theory also predicts that the cloud should heat up as it collapses. what physical law explains why it heats up?

Which are characteristics of natural selection? Check all that apply. It affects populations. It affects only individuals. It occurs when there is genetic variation. It occurs when organisms are genetically identical.

A moving train car collides with another train car that is motionless on the track. The train cars are the same size. How does the final momentum of the two cars compare to the momentum of the first car? a. Momentum is doubled. b. It is zero. b.

A helium balloon has an internal pressure of 2.5 atm when it occupies 4.5 L. If it was compressed until it had a pressure of 3.3 atm, what would be the final volume? Report your answer with the correct number of significant figures.

Which two processes allow water to enter the atmosphere

A horizontal 20.-newton force is applied to a 5.0-kilogram box to push it across a rough, horizontal floor at a constant velocity of 3.0 meters per second to the right. Calculate the coefficient of kinetic friction between the box and the floor.

Light acts like a. a wave. b. a particle. c. neither a wave nor a particle. d. both a wave and a particle.

A uniform rope of length L and negligible stiffness hangs from a solid fixture in the ceiling. The free lower end of the rope is struck sharply at time t=0.

A 62 pound box is on an incline. Determine the minimum force P that would result in the box starting to slide up the incline. (include units with answer)

During a collision with another car, the occupants of a minivan initially travelling at 4.0 m/s come to a complete stop in 0.5 s. What was the acceleration of the occupants of the minivan? a) 8.0 m/s2 b) - 8.0 m/s2 c) 2.0 m/s2 d) - 2.0 m/s2

A system dissipates 12 J of heat into the surroundings; meanwhile, 28 J of work is done on the system.