At a certain instant, a compact disc is rotating at 210 rpm. What is its angular speed in rad/s?
A) 11 rad/s
B) 22 rad/s
C) 45 rad/s
D) 69 rad/s
E) 660 rad/s
B
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Gravitational lenses formed by galaxy clusters can cause the images of some quasars to appear double.
Answer the following statement true (T) or false (F)
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT b. 4.9 mT c. 5.1 mT d. 4.7 mT e. 3.6 mT
Tritium (3H) has a half-life of 12.3 years and releases 0.0186 MeV energy per decay. What is the activity of a 9.0-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.01605 u)
a. 1.3 × 10^16 Bq c. 3.6 × 10^14 Bq b. 1.1 × 10^15 Bq d. 3.2 × 10^15 Bq
Total Internal Reflection: A scuba diver is 1.2 m beneath the surface of a still pond of water. At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is 1.33.
A. 41° B. 48° C. 59° D. 90° E. 0°