An automobile engine gives 35,000 BTUs of mechanical energy from 100,000 BTUs of fuel. The transmission, axles and tires deliver 30,000 BTUs of mechanical energy to the highway, moving the car forward. What is the overall efficiency of this vehicle?

An automobile engine gives 35,000 BTUs of mechanical energy from 100,000 BTUs of fuel. The transmission, axles and tires deliver 30,000 BTUs of mechanical energy to the highway, moving the car forward. What is the overall efficiency of this vehicle?

Answer: 30%

In a car, the non-useful, waste energy output is in the form of __________ energy.

In a car, the non-useful, waste energy output is in the form of __________ energy.

Answer: thermal/heat

Which energy conversion device typically has the lowest energy efficiency?

Which energy conversion device typically has the lowest energy efficiency?

Answer: automobile engine

The potential energy stored in the bonds that hold molecules together is called ________ energy.

The potential energy stored in the bonds that hold molecules together is called ________ energy.

Answer: chemical

Energy demand is a/an

Energy demand is a/an

Answer: exponential function - longer it goes, the more rapidly it grows

If the energy input of a system is 200 calories and its useful output is 36 calories, what is the efficiency of the system?

If the energy input of a system is 200 calories and its useful output is 36 calories, what is the efficiency of the system?

Answer: 0.18