Two train carts are moving in the same direction, such that one cart catches up with and collides with the second cart. That is, a 480-kg train cart moving at 14.4 m/s hits from behind a 570-kg train cart that is moving at 13.3 m/s in the same direction. If the new speed of the 570-kg cart is 14.0 m/s after the collision, what is the speed of the lighter cart after the collision

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Atoms in a molecule are bonded together by sharing gaining or losing_

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?