A(n) 6 kg object moving with a speed of 8.6 m/s collides with a(n) 17 kg object moving with a velocity of 11 m/s in a direction 20◦ from the initial direction of motion of the 6 kg object. 8.6 m/s 11 m/s 17 kg 6 kg 20◦ What is the speed of the two objects after the collision if they remain stuck together? Answer in units of m/s.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?