What do astronomers mean by the term "hot Jupiters"?
A) planets with masses and composition similar to what we would expect if Jupiter were hotter
B) massive planets that orbit stars that are more massive and hotter than our Sun
C) planets with masses similar to Jupiter, but that orbit very close to their central star
D) planets with masses similar to Jupiter, but compositions that are similar to Mercury
E) planets with masses and orbits similar to Jupiter but for which infrared observations indicate they are surprisingly hot in temperature
C) planets with masses similar to Jupiter, but that orbit very close to their central star
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A ball of mass 3m at speed v approaches a ball of mass 2m at speed -2v and they are about to collide. After the collision, what is the speed of the center of mass?
A. v B. -v/5 C. v/5 D. -v E. Can't decide because we don't know whether this collision is inelastic or elastic
What two quantities did Edwin Hubble plot against each other to discover the expansion of the Universe?
A) velocity and distance B) luminosity and distance C) velocity and temperature D) luminosity and temperature E) age and distance
A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction
If the wavelength of the incident photon is 0.6110 nm, what is the kinetic energy of the recoiling electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.5 × 10-18 J B) 1.9 × 10-18 J C) 3.1 × 10-18 J D) 4.3 × 10-18 J E) 5.2 × 10-18 J
Consider three galaxies, Alpha, Beta and Gamma. An observer in Beta sees the other two galaxies each moving away from him in opposite directions at speed 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c