Concept explainers
(a)
The amount of heat required to melt the ice.
Answer to Problem 123QAP
The amount of heat required to melt the ice is
Explanation of Solution
Given info:
Area covered by melted ice is,
Thickness of melted ice is,
Initial temperature of ice is,
Formula used:
Formula for the heat required to change the temperature is,
Formula for the heat required to change the phase is,
Calculation:
Density of melted ice is,
The mass of the melted ice can be calculated as,
The amount of heat required to melt the ice is,
Conclusion:
Thus, the amount of heat required to melt the ice is
(b)
The amount of gasoline that contains as much energy as in part (a).
Answer to Problem 123QAP
The amount of gasoline that contains as much energy as in part (a) is
Explanation of Solution
Given info:
The heat required to melt the ice is,
Heat released by 1 gallon of gasoline is,
Formula used:
Formula to calculate the amount of gasoline is,
Calculation:
Substituting the values in the above equation, we get
Conclusion:
Thus, the amount of gasoline that contains as much energy as in part (a) is
(c)
The amount of coal needed to be burned to produce the energy to melt the ice.
Answer to Problem 123QAP
The amount of coal needed to be burned to produce the energy to melt the ice is
Explanation of Solution
Given info:
The heat required to melt the ice is,
Heat produced by 1 ton of coal is,
Formula used:
Formula to calculate the amount of gasoline is,
Calculation:
Substituting the values in the above equation, we get
Conclusion:
Thus, the amount of coal needed to be burned to produce the energy to melt the ice is
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Chapter 14 Solutions
COLLEGE PHYSICS
- In an ultrahigh vacuum system (with typical pressures lower than 10-7 pascal), the pressure is measured to be 1.00 1010 torr (where 1 torr = 133 Pa). Assuming the temperature is 300 K, find the number of molecules in a volume of 1.00 m3.arrow_forwardIn 1993, the U.S. government instituted a requirement that all room air conditioners sold in the United States must have an energy efficiency ratio (EER) of 10 or higher. The EER is defined as the ratio of the cooling capacity of the air conditioner, measured in British thermal units per hour, or Btu/h, to its electrical power requirement in watts. (a) Convert the EER of 10.0 to dimensionless form, using the conversion 1 Btu = 1 055 J. (b) What is the appropriate name for this dimensionless quantity? (c) In the 1970s, it was common to find room air conditioners with EERs of 5 or lower. State how the operating costs compare for 10 000-Btu/h air conditioners with EERs of 5.00 and 10.0. Assume each air conditioner operates for 1 500 h during the summer in a city where electricity costs 17.0 per kWh.arrow_forwardAssuming the human body is primarily made of water, estimate the number of molecules in it. (Note that water has a molecular mass of 18 g/mol and there are roughly 1024 atoms in a mole)arrow_forward
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