Scientists estimate that a certain meteorite had a mass of about 1.4 10^8 kg (around 150,000 tons) and was traveling at nearly 12 km/s when it struck the earth. About how long would it take a standard coal fired power plant which generates about 1 billion joules per second to generate the same amount of kinetic energy as the meteorite when it hit the ground?

3 years
12 days
7.6 years
116 days

Which of the following is true about an object in free fall? its acceleration depends on its mass. it has no inertia. it pulls on earth, and earth pulls on it. its momentum is constant.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.