Suppose you put in 100 j of work on a lever and get out 93 j of work. what is the efficiency of the lever and how much of the work input is lost as heat in joules?

Why do hurricanes tend to form in warmer climates

Which of the following is an example of sustainable use of natural resources? Question 21 options: 1) clear-cutting a forest 2) continuously strip mining coal deposits in an area 3) harvesting huge populations of fish from a fishing shoal 4)

Which of these is an example of a mechanical wave? Ocean waves Microwaves used to heat food X-ray Light from a flashlight

A sound is first produced by making something. The sound then travels through a to reach the ears, which are the parts of the body that allow for sounds to be heard.

For heavy elements, what is the ratio of neutrons to protons that predicts a stable nucleus? A. 1:1 B. 1.5:1 C. 2:1 D. 10:5

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil