What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger.
B) It is the idea that clocks run slow for people moving at high speed past you.
C) It is the idea that everyone measures time differently, depending on his/her reference frame.
D) It is the idea that clocks run faster in stronger gravitational fields.
A
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On this map of Earth, which numbered circle represents the place where the Sun appears directly overhead at noon on the December solstice?
A) 3 B) 1 C) 2 D) 4 E) None of the answers are correct; the Sun can be directly overhead only on the equator.
Which of the following emits a spectrum very close to a blackbody spectrum?
A. an interstellar cloud B. the Sun C. a neon light
An electric field is set up between two parallel plates, each of area 2.0 m2, by putting 1.0 ?C of charge on one plate and -1.0 ?C of charge on the other
The plates are separated by 4.0 mm with their centers opposite each other, and the charges are distributed uniformly over the surface of the plates. What is the magnitude of the electric field between the plates at a distance of 1.0 mm from the positive plate, but not near the edges of the plates? (?0 = 8.85 × 10-12 C2/N • m2) A) 4.2 × 104 N/C B) 1.4 × 104 N/C C) 3.1 × 104 N/C D) 0.00 N/C E) 5.6 × 104 N/C
The capacitance per unit length of a very long coaxial cable, made of two concentric cylinders, is 50 pF/m
What is the radius of the outer cylinder if the radius of the inner one is 1.0 mm? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 0.50 mm B) 4.0 mm C) 2.0 mm D) 3.0 mm E) 1.0 mm