Which of the following is an example of speed? a) 8m/s b) 7 m/s north c) -3 m/s^2 east d) 5 m/s^2 east

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.