If ? = 9.0 V, what is the current in the 15-? resistor?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
a
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GUT theories predict that protons will eventually decay, causing all solid objects in the universe to fall apart if the universe keeps expanding forever
Indicate whether the statement is true or false
Which of these variable stars would be classified as a Cepheid?
A) a G giant with a period of 14 hours B) a B supergiant with a period of 0.14 days C) a K giant with a period of 14 days D) an F giant with a period of 14 years E) an M supergiant with a period of 140 days
What is the minimum distance of two points on the moon that can be just resolved by the Keck 10. meter telescope in Hawaii (use a wavelength of 600. nm, lunar distance of 380. thousand Km):
(a) if there were no atmosphere? (b) if the atmosphere limits resolution to 0.2 arc-sec?
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 230 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.84 s, 206 m/s b. 8.39 s, 119 m/s c. 6.85 s, 150 m/s d. 9.69 s, 103 m/s e. 3.43 s, 292 m/s