When gas in a container expands to three times its volume at constant temperature, the gas pressure
A) is one third.
B) is one ninth.
C) triples.
D) remains the same.
Answer: A
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What makes the Crab Nebula pulsar unusual among other pulsars?
A) It is a magnetar, with far more intense magnetic fields than any other. B) It is the oldest known pulsar. C) Its period is much less regular than other pulsars. D) It is the fastest spinning known pulsar. E) It is relatively bright in shorter wavelengths, like visible and X-rays.
A knight on horseback holds a 10-m lance. The horse can run at 0.78c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 7.1 m c. 10 m b. 15 m d. 6.3 m
A space exploration satellite is orbiting a spherical asteroid whose mass is 4.65 × 1016 kg and whose radius is 39,600 m, at an altitude of 12,400 m above the surface of the asteroid
In order to make a soft landing, Mission Control sends it a signal to fire a short burst of its retro rockets to change its speed to one that will put the satellite in an elliptical orbit with a periapsis (the distance of closest approach, as measured from the center of the asteroid) equal to the radius of the asteroid. What is the speed of the satellite when it reaches the surface of the asteroid? G = 6.67 x 10-11 N•m2/kg2. A) 4.32 m/s B) 6.11 m/s C) 7.18 m/s D) 9.43 m/s E) 5.74 m/s
Young's double slit experiment relies on the ___________________ of light.
A: Dampening B: Interference C: Refraction D: Reflection