You take a spectrum of a star and detect a balmer absorption series, but all of the wavelengths are shifted toward the blue, by 1%. the star is traveling:
a. toward you at v = 0.1c
b. toward you at v = 0.01c
c. neither toward nor away from you
d. away from you at v = 0.01c
e. away from you at v = 0.1c

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

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

What part of the ear is names after tools, such as the hammer and the anvil?