What causes reddening of starlight? Explain how the reddish color of the Sun's disk at sunset is caused by the same process.

One scientist is using an electromagnetic wave to map the dust between stars. The electromagnetic wave has a shorter wavelength than radio waves but a longer wavelength than visible light what electromagnetic wave is the scientist using?

Magnitude of force to accelerate a automobile

The velocity of a car changes from 10 m/s east to 30m/s east in 4 seconds. what is the acceleration of the car

A 2 kg blob of putty moving at 3m/s slams into a 2 kg blob of putty at rest calculate the speed of the two stuck together blobs of putty immediately after colliding

Astronomers have proposed the existence of an unexplained force that is causing the expansion of the universe to accelerate. What do they call this force? A) dark matter B) dark space C) dark stars D) dark energy E) dark holes

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

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?