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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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
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
The combining of two nuclei to form a larger nucleus with the release of energy is __________
Fill in the blank(s) with correct word