Concept explainers
(a)
The heat energy added to raise the temperature of water from
(a)
Answer to Problem 4SP
The heat energy added to raise the temperature of water from
Explanation of Solution
Given info: The mass of the water is
Write the expression to find the heat energy added to raise the temperature of water from
Here,
Substitute
Conclusion:
Therefore, the heat energy added to raise the temperature of water from
(b)
The amount of water increasing in the process.
(b)
Answer to Problem 4SP
The amount of water increasing in the process is
Explanation of Solution
Write the expression to find mass of the water increasing in the process.
Here,
Substitute
Conclusion:
Therefore, the amount of water increasing in the process is
(c)
The comparison of the increase in mass with the original mass.
(c)
Answer to Problem 4SP
The increase in mass is negligible when compared with the original mass.
Explanation of Solution
When we consider the expression of the ratio of the original mass to the increase in mass, the ratio becomes
This can be reduced to
Conclusion:
Therefore, the increase in mass is negligible when compared with the original mass.
(d)
The conversion of original mass into kinetic energy.
(d)
Answer to Problem 4SP
The conversion of original mass into kinetic energy gives
Explanation of Solution
Write the expression for conversion of original mass into kinetic energy.
Here,
Substitute
Conclusion:
Therefore, the conversion of original mass into kinetic energy gives
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Chapter 20 Solutions
PHYSICS OF EVERYDAY (LL) W/ACCESS CODE
- . On a winter day, the air temperature is — 15°C, and the humidity is 0,001 kg/m3. (a) What is the relative humidity? (b) When this air is brought inside a building, it is heated to 20°C. If the humidity isn't changed, what is the relative humidity inside the building?arrow_forwardAs air rises in the atmosphere, its temperature drops, even if no heat flows out of it. (a) Based on what you learned in Sections 4.4 and 5.3, explain why this is so. (b) Cumulus clouds form when rising air is cooled to the point where water droplets form because of condensation. Why are these clouds usually much higher above the ground in dry climates than in wet ones?arrow_forward1. How much energy is lost by 20 kg copper if it is cooled from 50 ℃ to 30℃? 2. A 20 kg metal rod is heated 100oC with 2000 J of energy. What is the specific heat of the metal?arrow_forward
- The specific heat capacity of steel is 450 J/kg?°C. Show that the amount of heat needed to raise the temperature of a 10-kg piece of steel from 0°C to 100°C is 450,000 J. How does this compare with the heat needed to raise the temperature of the same mass of water through the same temperature difference? a, which differs for different materials. We define a C; that is, ΔL/L perC. For aluminum, a = 24 * 106>°arrow_forward1) Lake Erie contains roughly 4.00 x 1011m3of water. How much energy is required to raise thetemperature of that volume of water from 11.0°C to 12.0°C? How many years would it take to supplythis 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 substanceto 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 ofthe 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 intolight 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 aconstant velocity. 6)About how much power does a70 kg sprinter…arrow_forwardWhat are the main methods of heat transfer from the hot core of Earth to its surface? From Earth’s surface to outer space?When our bodies get too warm, they respond by sweating and increasing blood circulation to the surface to transfer thermal energy away from the core. What effect will this have on a person in a 40.0ºC hot tub?arrow_forward
- An incandescent light bulb with a surface area of 0.0145 m2 and an emissivity of 0.87 has a surface temperature of 171.3°C. If the temperature of the surroundings are 24.7°C, what is the net rate of radiation heat transfer between the bulb and the surroundings? [round your final answer to one decimal place]? {σ = 5.6704 x 10-8 W/(m2∙K4)}arrow_forward1.4L of vegetable oil is being heated. Vegetable oil contains an average density of 930kg/m3 and a specific heat of 1670J/kg degrees C. How much heat was transferred to the oil if it was heated from 21 degrees C to 90 degrees C? (1L=0.001m3)arrow_forward1a)A college student produces about 109 kcal of heat per hour on the average. What is the rate of energy production in joules? =__________kJ/h 1b) How much heat in kcal must be added to 0.40 kg of water at room temperature (20°C) to raise its temperature to 45°C?=_________ kcalarrow_forward
- 6.5 kg of water (c = 4189 J/(kg⋅K)) is heated from T1 = 11° C to T2 = 21° C. - Part (a) Input an expression for the heat transferred to the water, Q. - Part (b) Calculate the value of heat transferred to the water Q in joules, using the expression from part (a). - Part (c) To the heated water 0.5 kg of water at T3 = 20° C is added. What is the final temperature of the water, in kelvin?arrow_forwardHow much heat is needed to raise the temperature of 2 kg of water 5K? a. 41800J b. 42800J c. 43800J d. 44800Jarrow_forwardApproximately how much energy would be required to raise the temperature of the top layer of the oceans by 1°C? (1 m3 of water has a mass of 1000 kg.)A. 1 × 1024 J B. 1 × 1021 JC. 1 × 1018 J D. 1 × 1015 Jarrow_forward