1) Lake Erie contains roughly 4.00 x 1011 m 3 of water. How much energy is required to raise the temperature of that volume of water from 11.0°C to 12.0°C? How many years would it take to supply this amount of energy by using the 1 000-MW exhaust energy of an electric power plant?
1) Lake Erie contains roughly 4.00 x 1011
m
3
of water. How much energy is required to raise the
temperature of that volume of water from 11.0°C to 12.0°C? How many years would it take to supply
this amount of energy by using the 1 000-MW exhaust energy of an electric power plant?
2) A scientist is trying to determine the specific heat of 10.0 g of an unknown substance. He heats up the substance
to a temperature of 100.0 C, and places it in 1.02 kg of water at 22.0 C. He notices that the final temperature of
the water and substance is 23.1 C. What is the specific heat of the substance?
3)A 68 kg diver drops from a height of 12 m. What is her speed as she hits the water?
4) An incandescent bulb has a power rating of 75 W but is only 5 % efficient. How much energy is converted into
light if the bulb is run for 6.0 s ?
5) Determine the coefficient of friction for a floor if 550 J of work are done moving a 12 kg box 10.0 m at a
constant velocity.
6)About how much power does a70 kg sprinter produce if he moves from rest to 4.0 m/s in 5.0 seconds?
7)A crane is being used to build a skyscraper. The engine can lift with 6900 W of power. How long will it take the
crane to lift a 2100 kg beam to a height of 120 m?
8)A 2.0 g bullet initially moving with a velocity of 87 m/s passes through a block of wood. On exiting
the block of wood, the bullet’s velocity is 12 m/s. How much work did the
bullet as it passed through the wood?
9) A 2.0 g bullet initially moving with a velocity of 87 m/s passes through a block of wood. On exiting
the block of wood, the bullet’s velocity is 12 m/s. If the wood block was 4.0 cm thick, what was the
average force that the wood exerted on the bullet?
10) The specific heat of copper is 380 J/kg C. What will happen to the temperature of 12 g of copper if it loses 12
J of thermal energy?
11)The specific latent heat of fusion for gold is 1.1 x 10^6 J/kg. How much energy is required to melt 15 g of gold
when it changes from a solid to a liquid?
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