What causes muscles to move?

Which of the following is an example of a concave mirror? surveillance mirror car side mirror reflecting telescope microscopes

A diffraction grating has 500 slits/mm. What is the longest wavelength of light for which there will be a third-order maximum?

What is occurring when two waves traveling along the same medium meet and cancel each other out? a.) destructive interference b.) constructive interference c.) reflection d.) refraction

Why does it seem harder to start sliding a couch across a carpeted floor than it does to keep it moving?

How has the concept of a "planet" changed since the 16th century before the invention of the telescope? Do you think this shows scientific accuracy or disproves future facts, as one assumes that they will be discredited in time too?

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

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength