Which of the following wavelengths could NOT be present as a standing wave in a 2 m long organ pipe open at both ends?
a. 4 m
b. 2 m
c. 1 m
d. 0.89 m
e. 0.5 m
D
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Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 20 km/s/Mly. How fast would a galaxy 1000 Mly distant be receding from us?
A) 20,000 km/s B) 20 Mly/s C) 0.20 times the speed of light D) 50 km/s E) 20 km/s
Webpage collect information into ______, which are searchable records that companies can use for mailing lists, tracking purposes and more.
A. files B. repositories C. forms D. databases
Creation science claims that scientific evidence can and does prove God made the universe. Select the statement which does not identify a legitimate objection to this claim. (Recall the hallmarks of science.)
A) If "God did it" is the explanation for everything, then final exams in astronomy would be very simple (all answers would be the same!), and science experiments would be very easy to explain, but we wouldn't learn much about the natural world. B) Science cannot prove (or disprove) the existence of a superpowerful, supernatural deity. C) The statement that "God did it" cannot be falsified by science, and therefore it is not a statement that science can test. D) Scientists are not allowed to believe in God.
At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the velocity of the projectile is 4.0 m/s directed 30° above the horizontal?
a. +39 W b. ?78 W c. ?39 W d. +78 W e. +25 W