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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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- A granite ball of radius 9.00 m and emissivity 0.046 is heated to 150°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least the nearest Kelvin.) K (b) What is the surface area of the ball? m2 (c) If the ambient temperature is 25.0°C, what net power does the ball radiate? Warrow_forwardA granite ball of radius 4.00 m and emissivity 0.042 is heated to 150°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least the nearest Kelvin.) K(b) What is the surface area of the ball? m2(c) If the ambient temperature is 25.0°C, what net power does the ball radiate? Warrow_forwardHow much heat energy needs to be given up to freeze 2.12 kg of milk if initially the milk was at the room temperature 20 oC? Assume that the latent heat of fusion of milk is 275700 J/kg, and the specific heat of milk is 3890 J/kgoC.arrow_forward
- A man was out snowboarding and notices what when he touches the metal part of chair lift it feels colder than the rubber seat. Are the two the same temperature? Explain using appropriate terms from the energy unit! Paragraph BI + v Lato (Recom.. v 19px .. v 日 合 ofarrow_forwardLake Erie contains roughly 4.65×1011 m³ of water. How much heat is required to raise the temperature of that volume of water from 12.3°C to 13.6°C? 2.53×1018 J You are correct. Your receipt no. is 161-2792 ? Previous Tries How long would it take to supply this amount of heat by using the full output of a 1240MW electric power plant? (Note that 1MW = 106W) Submit Answer Incorrect. Tries 1/10 Previous Triesarrow_forwardA 160 g copper bowl contains 120 g of water, both at 25.0°C. A very hot 420 g copper cylinder is dropped into the water, causing the water to boil, with 5,00 g being converted to steam. The final temperature of the system is 100°C. Neglect energy transfers with the environment. (a) How much energy is transferred to the water as heat? (b) How much to the bowl? (c) What is the original temperature of the cylinder? The specific heat of water is 1 cal/g-K, and of copper is 0.0923 cal/g-K. The latent heat of vaporization of water is 539 Cal/kg.arrow_forward
- why is the answer positive if the change in temperature is negative (initially at 100C then went down to 34C) isnt change in temperature Tf-Ti, so it would be 34-100 =-66C? also energy is being transferred out so wouldnt the answer be -6910 insteadarrow_forward100 g of ice with a temperature of -15°C is placed in an insulated vessel with 1.00 liters of water whichhas a temperature of 20°C. What will be the final temperature of the water at thermodynamic equilibrium thenwe assume the system is isolated? The specific heat capacity of ice is 2.11 kJ/(kg ∙ °C). b) We have a large open vessel with water, where we drainvia a small tap as shown in Fig. 4a. What will happen to the watervelocity at A? Is the flow turbulent? Motivate!Fig.4a solve the question completely and give final answer with full details thanksarrow_forward
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