Which event is associated with convergent boundaries A. Formation of island chains
B. Creation of mid-ocean ridges
C. Creation of convection currents
D. Formation of rift valleys

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.