When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference? Select one:

The ____________________ hypothesis for the formation of the moon suggests that the moon and Earth formed from the same cloud of material and coalesced as two separate objects

Fill in the blank(s) with correct word

A gravitational "sling-shot":

A) causes comets to crash into planets, such as Jupiter in 1994. B) allowed the Apollo astronauts to reach the Moon in 1969. C) is the accepted theory for the formation of the asteroid belt. D) changes the speed and direction of a spacecraft nearing a massive planet. E) explains how the solar system was formed after a near collision with another star.

Which of the following molecules would probably be isolated closest to the bottom of a fractionating tower at a refinery?

A) C4H10 B) C8H18 C) C10H22 D) C20H42 E) C40H82

A rifle sight is set so that you will hit a target at 100m. If, instead, you wish to hit a target closer than 100m, should you aim high or low?

A. You should aim high, since the bullet will drop due to the effect of gravity B. You should aim directly at the target, if the rifle sight is set, it will aim true no matter the distance to the target C. You should aim low, since the bullet will not drop as much as expected due to the effect of gravity