The input work done on a pulley system is 450J. What is the efficiency of the pulley system if the output work is 375J

Which statement best describes beaches? Beaches change over time as waves move further up the shore. Beaches are always changing due to factors such as waves adding and eroding sand. Beaches change little over time as wind patterns stay the same.

How does the size of a planet affected the amount and type of gas in its atmosphere

Define and give 2 examples of kinetic energy. Be sure to include the two factors that make an object's kinetic energy increase.

Uranium-235 has to be enriched before it can be turned into fuel rods. This enrichment is achieved by 1.___ and2.

Explain the relationship between short and long wavelengths and low and high frequency

A ___ is awarded to the opposing team when that team violently or dangerously charges a opponent. (in soccer) A) Goalie kick B) Indirect kick C) Direct kick D) Throw in

Which has greater potential energy, a book on the top shelf of a bookcase or a book on the bottom shelf? Why?

Fusion occurs with atoms of elements less massive than a. iron. b. helium. c. calcium. d. uranium.

Which describes what happens when fuel is ignited in a heat engine? A. Chemical energy is converted into thermal energy B. Thermal energy is converted into solar energy. C. Solar energy is converted into chemical energy D.

What happens during the intake and compression strokes of a four stroke engine?