Please show the answers step by step. Thanks. As always, solve each problem symb

Question

Please show the answers step by step.

Thanks.

As always, solve each problem symbolically until the final step. 1) A compact car travelling at 55 mph (24.6 m/s) averages 32 mpg. How much time will it take to burn one gallon of gas? 2) The car above produces an output power of 8600 J/s to maintain constant speed. Estimate the efficiency of the car, given that 1.3 x 10aJ of energy are released when a gallon of gas is burned. 3) How much energy from the gallon of fuel is exhausted as heat to the environment?

Explanation / Answer

question 1

According to the given data,
It takes 32 miles to burn one gallon of gas
We need to calculate the time it takes to travel 32 miles
Avg speed : 55 miles per hour
Therefore time required to travel 32 miles = 32/55 hrs = 0.58 hrs ~ 35 minutes

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