Light enters a Newtonian reflection telescope and hits a mirror inside the telescope to redirect the light to the eyepiece. The light strikes the mirror at an angle of 45 degrees. What angle is it reflected back off the mirror towards the eyepiece?

A) 15 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Give an example in which the electrical energy changes to light energy