Atrain is moving with a constant velocity of 83 m/s in the easterly direction.

a girl on the train looks out the window and sees a boy outside with a toy rocket.

the boy fires the rocket with an initial velocity of 9.8 m/s straight up into the air.

how far does the train travel in the easterly direction while the toy rocket is in the air, i. e. how far does the train travel during the time it takes the rocket to go up and back down to the ground again?

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?

When an object is heated it contracts. a. true b. false

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)