An engine takes in 200 J of heat, expels 40 J of heat, and does 160 J of work. What is the efficiency of the engine?

A. 40%

B. 60%

C. 80%

D. 20%

8. A car travels at a constant velocity of 70 mph for one hour. By the end of the second hour, the car's velocity was 60 mph. At the end of the third hour, the car's velocity was 80 mph.

The repeated rising and sinking of water during boiling is due to

Choose the molecule that has an unbalanced arrangement of charge. A. Chlorine gas (a diatomic molecule, Cl2) B. Nitrogen gas (a diatomic molecule, N2) C. Water D. Carbon dioxide

A boat is trying to head due west across a river at 20 m/s. If the river current pushes it off course by flowing 15 m/s due south, what would be the resultant velocity of the boat? If the river is 600 m wide how long does it take to get across?

In an investigation that uses the scientific method, which step immediately follows asking a question? presenting the results making observations creating a hypothesis designing an experiment

A generator converts

The standard international unit of measurement S I for mass is the what

What is the stopping distance at night for a passenger vehicle traveling at 50 mph?

How does mass affect weight

Communicable diseases can be prevented by: