A heat engine receives 7 900 J of heat from its combustion process and loses 3 200 J through the exhaust and friction. What is its efficiency?
a. 59%
b. 35%
c. 21%
d. 41%
e. 77%
a
You might also like to view...
Significant Figures: If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?
A. 3.86 m2 B. 3.863 m2 C. 3.864 m2 D. 3.8638 m2 E. 3.86379 m2
The pressure in a liquid depends on liquid
A) density. B) depth. C) both of these D) none of the above
A 30.0 cm wrench is used to generate a torque at a bolt. A force of 40 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 5.0 N•m. B. 7.0 N•m. C. 9.0 N•m. D. 12 N•m. E. 20 N•m.
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 x 10-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is __________
Fill in the blank(s) with correct word