What equals the number of protons in an atom

Can you access an instance variable from a static method? explain why or why not.

A student stands a distance L from a wall and claps her hands. Immediately on hearing the reflection from the wall she claps her hands again. She continues to do this, so that successive claps and the sound of reflected claps coincide.

force of 50 N is applied to a 100 kg boulder, which starts at rest and moves 5.5 meters accross a level frictionless cliffside that is 12 meters high. How fast is the boulder moving when it leaves the cliff?

Which can happen during a physical change? A. The molecules in a substance react with other molecules. B. The molecules in a substance are destroyed. C. Molecules can move more rapidly and freely and change states. D.

The speed of an electromagnetic wave is a constant, 3.0 * 108 m/s. The wavelength of a wave is 0.3 meters. What is the frequency? A. 9.0 * 108 Hz B. 1.0 * 109 Hz C. 1.0 * 108 Hz D. 9.0 * 107 Hz

Calculate the gravitational potential energy relative to the ground when an 82 kg person climbs to the top of a 2.0 m stepladder.

A rock is thrown from a cliff and hits the ground five seconds later at a distance of 50 m from the cliff how high was a cliff

A 15.0 m long plane is inclined at 30.0 degrees. If the coefficient of friction is 0.426, what force is required to move a 40.0 kg mass from rest at the bottom on the plane to the top of the plane with a final velocity of 8.00 m/s?

In a pig-calling contest, a caller produces a sound with an intensity level of 60 db. how many such callers would be required to reach the pain level of 120 db? 2 incorrect: your answer is incorrect.

Why is the use of scientific names important in biology?