The energy radiated by a typical quasar requires that its black hole accrete about:
A) one solar mass a century.
B) one solar mass a decade.
C) one solar mass a year.
D) ten solar masses a year.
E) one solar mass a day.
D
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An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10-19 C)
A) 4.8 × 10-14 N B) 1.9 × 10-15 N C) 5 × 10-20 N D) 0 N E) 2.2 × 10-24 N
Why don't we see very many low-mass exoplanets?
What will be an ideal response?
The electric field strength in the space between two closely spaced parallel disks is 1.0 × 105 N/C. This field is the result of transferring 3.9 × 109 electrons from one disk to the other
What is the diameter of the disks? (e = 1.60 × 10-19 C, ?0 = 8.85 × 10-12 C2/N ? m2) A) 3.0 cm B) 1.5 cm C) 4.5 cm D) 6.0 cm
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity of the sound wave 100 m from the source is
A. 2.2 milliWatts/m2. B. 2.0 milliWatts/m2. C. 1.8 milliWatts/m2. D. 1.6 milliWatts/m2. E. 1.2 milliWatts/m2.