An ideal gas undergoes an adiabatic process while doing 25 J of work. What is the change in internal energy?
A)
zero
B)
50 J
C)
25 J
D)
-25 J
E)
none of the above
D
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In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball?
a) catcher has done positive work b) catcher has done negative work c) catcher has done zero work
All of the following observations are real. Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes?
A) X-ray emission from active galactic nuclei can vary significantly in times as short as a few days. B) The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun. C) Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed. D) The most luminous active galactic nuclei have huge redshifts.
Camera #1 has a lens of diameter 2.0 cm with a focal length of 5.0 cm, camera #2 has a lens of diameter 1.5 cm with a focal length of 4.5 cm, and camera #3 has a lens of diameter 1.1 cm with a focal length of 3.3 cm. Assuming all the cameras use the same type film and have a shutter speed of 1/200 s, which camera can give the best exposure at the lowest light level?
1.#3 2.#2 3.#2 and #3 are both equal and better than #1. 4.#1
Relative Velocity: Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?
A. 20 min B. 22 min C. 24 min D. 30 min