A machine increases the potential energy of a heavy load by about 1000 J with a work input of 2000 J. The efficiency of the machine is about
A. 50%.
B. 80%.
C. 20%.
D. 10%.
Answer: A
You might also like to view...
What does the prefix meta, such as in metaconglomerate, mean?
A) formed near to B) changed C) formed by process of D) made of
Which factor must increase in order for a river to pick up larger particles?
A) velocity B) viscosity C) shear stress D) water depth
Damage caused by hurricanes can be divided into three categories: ________, ________, and ________.
A) structural damage; beach erosion; temperature increases B) storm surge; wind damage; heavy rains and flooding C) property damage; fatalities; temperature decreases D) coastline damage; biological decay; inland erosion
Major earthquakes are often followed by somewhat smaller events known as ________
A) hyposhocks B) tremors C) foreshocks D) aftershocks