Which of the following elements is not radioactive?

a. Francium

c. Radium

b. Radon

d. Titanium

How can you find magnitude of velocity from a displacement time graph of an object?

Which type of friction occurs between moving machine parts bathed in oil? 1. static friction 2. rolling friction 3. fluid friction

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. The area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?

What is the reason for different metals emitting different colors of light?

Explain the phases of matter.

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away. A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

If you have a beam perfectly balanced on a fulcrum and put a weight at the very end of one side, is there a way to know where you should put a heavier object on the other end?

Most of the Earth's volcanoes occuWhen fossils or minerals form, certain unstable elements are sometimes locked into them.

a man is standing on the edge of a 20.0m high cliff. he throws a rock vertically with an initial velocity of 10.0m/s. how high does the rock go?

The slope of a velocity time graph over any interval of time gives the during that interval