The formula mass of water, H2O, is
a. 18 u.
b. 9 u.
c. 10 u.
d. 17 u.
a
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Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 100 Mpc away would have a recession velocity of ____
a. 0.7 km/s b. 1.43 km/s c. 30 km/s d. 170 km/s e. 7,000 km/s
Which of the following forces are exerted on a satellite that is in orbit around Earth?
A. an attractive gravitational force directed toward the center of Earth B. a force in the direction of the satellite's motion C. an outward force directed away from the center of Earth D. a and b
Which of the following is a similarity between Frederick W. Taylor and Lillian Gilbreth?
a.They both developed time study. b.They both strove to simplify work. c.They both proposed giving workers longer work hours and fewer breaks. d.They both used film cameras to analyze jobs.
A tennis player on serve tosses a ball straight up. As the tennis ball travels through the air, its speed
1.increases. 2.decreases. 3.decreases and then increases. 4.increases and then decreases. 5.remains the same.