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Q. 40

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 792

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Short Answer

A refrigerator has a compressor, but the compressor runs only of the time.

a. If electricity costs, what is the monthly (30 day) cost of running the refrigerator?

b. A more energy-efficient refrigerator with an compressor costs more. If you buy the more expensive refrigerator, how many months will it take to recover your additional cost?

a. The monthly cost will be

b. Months are

See the step by step solution

Step by Step Solution

Part (a) Step 1: Given information

We have given,

Power =

Running time =

We have to find the cost of running refrigerator.

Step 2: Simplify

The time is given as

Since, the compressor runs only of time.

then,

Since the energy is equal is given by,

Then, the monthly cost will be,

cost=

cost =

Part (b) Step 1: Given information

we have given,

power=

Time =

We have to find the month which is requires to recover the cost.

Step 2: Simplify

Since,

Power =

time=

Then,

Energy will be given by,

Then,

The total cost will be for month,

Total cost

Total cost save per month will be,

save=

Then,

For spending the the required months will be,

required months=

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