Acart of mass 6.0 kg moves with a speed of 3.0 m/s towards a second stationary cart with a mass of 3.0 kg. the carts move on a frictionless surface and when the carts collide they stick together. what is the ratio of the initial kinetic energy of the two-cart system to the final kinetic energy of the two-cart system?

a. 2
b. 1.5
c. 2.5
d. 1.25
e. 3

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?