A year is defined as
A) the time it takes for Earth to complete a rotation on its axis.
B) the time it takes for the Moon to complete an orbit of Earth.
C) the time it takes for the Moon to complete a phase cycle.
D) the time it takes for Earth to complete an orbit around the Sun.
E) the time it takes for the Sun to complete an orbit around Earth.
D
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Briefly explain why radiation was trapped for 300,000 years during the era of nuclei, and why the cosmic background radiation broke free at the end of this era
What will be an ideal response?
The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
a. 105°E b. 75°E c. 15°E d. 15°W e. None of the above
What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A) -2.5 diopters B) -0.50 diopters C) +2.5 diopters D) +4.0 diopters E) -50 diopters
A straight wire 20 cm long, carrying a current of 4 A, is in a uniform magnetic field of 0.6 T. What is the force on the wire when it is at an angle of 30° with respect to the field?
A) 0.2 N B) 0.3 N C) 0.4 N D) 0.5 N E) 0.6 N