A light-year is:

a. the distance light travels in one year

b. about 19 trillion miles

c. based on the distance from the earth to the sun

d. all of the above

Nuclear fusion and nuclear fission are different because

All stars you see with your unaided eye are

What is the best description of the acceleration of an object?

On a roller coaster, describe the kinetic and potential energy of the car at the top of the first hill, the bottom of the first drop, and later in the ride.

Why is parabolic shape is important for a concave mirror

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?