Eighty percent of ________ type stars have orbiting companions.
A. O and B
B. F and G
C. K and M
D. A and F
Answer: A
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An electron beam contains 
electrons per 
and is confined to circular region of diameter 0.025 mm. The electrons in the beam are extremely energetic, and travel at nearly the speed of light. What is the current in the beam?
A. 1.4 A B. 3.5 mA C. 350 mA D. 14 mA
Which of the following statements comparing Uranus and Neptune is correct?
A. Neptune has larger diameter and smaller mass. B. Uranus has larger diameter and more mass. C. Neptune has larger diameter and more mass. D. Uranus has larger diameter and Neptune has more mass.
Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic collision with the floor, and rebounds to shoulder height. Compare the magnitudes of the impulses delivered to the ball by gravity and by the floor during this entire motion.
A. The floor delivers an upward impulse, but gravity does not deliver a total impulse B. The two impulses have the same magnitude C. The impulse delivered by the floor is half as large as the impulse delivered by gravity D. The impulse delivered by the floor is twice as large as the impulse delivered by gravity
The apparent brightness of a star is 1.0 × 10-12 W/m2 and the peak wavelength is 600 nm. Estimate its distance from us
A) 0.090 pc B) 0.90 pc C) 9.0 pc D) 90 pc E) 900 pc