What class lever is a

1. Pencil Sharpener

2. Tennis racket

3. Hole puncher

4. Can opener

An electromagnetic wave of frequency 10^21 Hz is best classified as _. A. a gamma ray B. a radio wave C. Visible light D. a microwave

Students are experimenting with a substance that they think can be added to soil to increase the number of flowers a certain plant will make. They set up 20 pots of soil, each planted with the same type of seed.

Why are jovian planets so much larger than terrestrial planets?

A force of 1500 N is applied to a 1500 kg out. What is the acceleration of the car?

Challenge: Some but not all of the gasoline used by car's enegine is transformed into kinetic energy. Where might some of the energy go in this system?

When the velocity of a mass on a spring is zero, the acceleration is at

Which is a disadvantage of using wind as an energy source? Check all that apply. It may be unreliable. It is not naturally occurring. It produces a lot of waste. It requires wires to carry electricity. It generates large amounts of electricity.

One step in the production of hydroelectric power involves

A pot is heated on a stove. The water begins to boil rabidly. Which explains why the water is boiling fast?

A galvanometer can be calibrated to read electric A) current B) Voltage C) either of these D) neither of these