What is amplitude, wavelength, and frequency?

Which statement about plasma is true? A) It contains free electrons. B) It is an electrically neutral gas. C) It contains diatomic gas molecules. D) It can freeze. It is found only in space.

A 20 kg object is dropped from a very tall building. What is the weight of this objects? After 5 seconds, how has the object fallen and what is its speed at this instant?

When a ball rolls down an inclined plane, it gains speed because of gravity. When rolling up, it loses speed because of gravity. Why doesn't gravity play a role when it rolls on a horizontal surface?

Radiation with a wavelength of 238 nm shines on a metal surface and ejects electrons that have a maximum speedof 3.75 X 105 m/s. Which one of the followingmetal is it, the calues in paretheses being the work functions: a) potassium (2.

A rocket ship leaves the Earth's atmosphere. Its initial velocity is less than its final velocity. Which is this an example of

A tube, open at only one end, is cut into two shorter (nonequal) lengths. The piece that is open at both ends has a fundamental frequency of 422 Hz, while the piece open only at one end has a fundamental frequency of 666 Hz.

Table tennis the path of a table-tennis ball after being hit and hitting the surface of the table can be modeled by the function h=-4.9t (t-0.42) where h is the height in meters above the table and t is the time in seconds.

A coat rack weighs 65.0 lbs when it is filled with winter coats and 40.0 lbs when it is empty. The base of the coat rack has an area of 452.4 in2.

An initially stationary object experiences an acceleration of 6 m/s2 for a time of 15 s. How far will it travel during that time?

How was helium first discovered? mining of the radioactive element uranium using spectral analysis of the Suns' emission spectra o hubble obtaining samples from explosions off the surface of the sun deep sea mining off the coast of Texas