What do you think a black hole is

A wire in a lamp that is turned on would have a magnetic field around it. true or false.

What is the refraction index of a medium? -the ratio of the velocity of light in the medium over the velocity of light in a vaccum -the ratio of the velocity of light ina vacuum over a velocity of light in the medium -the ratio of the angle of

The presence of which phenomenon proved the predictability of the big bang theory?

If the 15.0 cm string is shorter than the 30.0 cm string. The frequency of the 15.0 cm string is how many times higher than the frequency of the 30.0 cm string? If the 15.0 cm string is shorter than the 30.

Is gravity an internal force or external force?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.

Are cosmic rays and gamma rays invisible or do they have color?