A grating is made with 600 slits per millimeter. What is the slit separation?
A. 600 nm
B. 
C. 
D. 160 pm
E. 916 nm
B.
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When discussing stellar lives, astronomers divide stars by mass into low-mass, intermediate-mass, and high-mass stars. Which category includes our Sun?
A) The Sun is a low-mass star. B) The Sun is an intermediate-mass star. C) The Sun is a high-mass star.
Two charges are separated by a certain distance. If the magnitude of each charge is doubled the force on each charge is
a. halved. b. doubled. c. tripled. d. quadrupled.
Jenny drives at a constant speed of 15 m/s around a circular drive of diameter 60 meters
(a) Determine her acceleration in m/s2. (b) Is her acceleration tangential, centripetal, or centrifugal? (c) Is her velocity tangential, centripetal, or centrifugal?
The vertical speed of a projectile
a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.