A 60 kg astronaut hovering in an orbiting space station throws a 1.0 kg water bottle (that he is holding) across the room at a speed of 8.0 m/s. What is the magnitude and direction
of the astronaut's velocity after he throws it?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

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?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving