An electron of mass 9.11 × 10^-31 kg moves with a speed of 0.800c. What is its momentum? (c = 3.00 × 10^8 m/s)
a. 3.64 × 10^-22 kg×m/s
c. 6.03 × 10^-22 kg×m/s
b. 2.05 × 10^-22 kg×m/s
d. 1.34 × 10^-22 kg×m/s
A
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How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?
A) A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits. B) When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit. C) When migrating planets collide, they would move onto more eccentric orbits. D) When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.
What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg B) 5.38 × 10-19 kg C) 3.84 × 10-20 kg D) 8.68 × 10-13 kg
Which of the following best describes the image for a thin, convex lens that forms whenever the object is at a distance less than one focal length from the lens?
a. upright, diminished, and virtual c. upright, enlarged, and virtual b. inverted, diminished, and real d. inverted, enlarged, and real
Three identical point charges Q are placed at the vertices of an equilateral triangle (length of each side = 2.0 m). If Q = 60 mC, what is the magnitude of the electrostatic force on any one of the charges?
a. 25 N b. 19 N c. 14 N d. 22 N e. 16 N