Calculate the refractive index of the substance if the speed of light in the medium is 210,000 km/s.

2.43

1.43

0.7

1.89

A snail can crawl 160cm at an avg speed of 4cm/min. If it crawled at an avg speed of 5cm/min instead, how much sooner would it take to reach the destination?

What is the string theory.

How do scientists assess changes in land cover and land use

The cycle of day and night is a result of Earth's spinning on its axis, which is Earth's .

Laser light is high powered, directional, coherent, and has a double wavelength. true or false.

Choose The units of 1/4πε0 are: A. N2C2 B. N • m/C C. N2 • m2/C2 D. N • m2/C2 E. m2/C2

What does a fern ultimately depend on as an energy source?

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.