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)
C
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A car moving at a constant speed goes around a curve of 400-ft radius and then goes around a second curve of 200-ft radius. The centripetal force acting on the car as it goes around the 200-ft radius curve is ___________ the value of the centripetal force acting on the car as it goes around the 400-ft radius curve
a. one quarter b. one half c. the same as d. twice e. four times
Four 12
resistors are connected together.
A. 12
B. 24
C. 36
D. 48
E. 44
A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
A. 68 m/s B. 44 m/s C. 56 m/s D. 80 m/s E. 36 m/s
The combining of two nuclei to form a larger nucleus with the release of energy is __________
Fill in the blank(s) with correct word