You observe a distant galaxy. you find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. what do you conclude?

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.

What do you think car designers do if the damage caused by a crash test is too severe?

What is the coefficient of kinetic friction μk between the block and the tabletop?