The advantages of infrared waves are . A. that they harden dental fillings and make vitamin D in the body

B. that they sterilize medical equipment and kill cancer cells

C. that they provide warmth and read information stored on computer disks

D. that they inspect packaged products and set broken bones

What happens to light waves from a star as the star moves away from earth?

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.