Concept explainers
(a)
The monthly bill.
(a)
Answer to Problem 62GP
Explanation of Solution
Given:
Power of heater,
Power of lightbulb,
Power of electric stove:
Formula used:
To calculate the cost of the energy, multiply the kilowatts of power consumed by the number of hours in operation times the cost per
Calculation:
According to the question, first calculate the total power:
Calculate the cost of the energy,
Conclusion:
The monthly bill:
(b)
Mass of coal that must be burned by
(b)
Answer to Problem 62GP
Approximately
Explanation of Solution
Given:
Efficiency is
Energy of coal is
Formula used:
Formula used to calculate coal mass:
Calculation:
calculate coal mass by using the formula:
Conclusion:
The coal mass is approx.
Chapter 18 Solutions
Physics: Principles with Applications
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