How long does it take an O-type star to form, compared to the time for a solar-type star to form?
A) 1/300 as long
B) 1/30 as long
C) about the same time
D) 30 times longer
E) 300 times longer
B
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O-type stars in our galaxy are
A) very common, making up about 50% of the total B) fairly common (several percent) C) very rare (less than 1%) D) the most common type of stars in our galaxy (75% or more)
An inductor, battery, resistance, and ammeter and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?
a. zero b. battery voltage divided by inductance c. battery voltage times inductance d. battery voltage divided by resistance
The Moon's average distance from Earth is about ______________ km
Fill in the blank(s) with correct word
Imagine that you are pulling your little sister on a sled and that the sled is speeding up. The diagram shown here is the free-body diagram for the sled. The net force on the sled in the vertical (up/down) direction is _________, but the net force in the horizontal direction is _________
a. zero/zero b. zero/pointing to the right c. zero/pointing to the left d. pointing upward/zero e. pointing downward/zero