Which is the best description of Earth's orbit?
Which is the best description of Earth's orbit?
A) It is nearly circular with Earth slightly closer to the Sun in summer in the northern hemisphere.
B) It is nearly circular with Earth slightly closer to the Sun in winter in the northern hemisphere.
C) It is highly elliptical with Earth slightly closer to the Sun in summer in the northern hemisphere.
D) It is highly elliptical with Earth slightly closer to the Sn in winter in the northern hemisphere.
B) It is nearly circular with Earth slightly closer to the Sun in winter in the northern hemisphere.
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In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch
If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment? A) 3.00 × 108 m/s B) 3.00 × 10-8 m/s C) 3.22 × 108 m/s D) 3.22 × 10-8 m/s E) 2.25 × 108 m/s
Typically a granule in the photosphere is about
A) the size of Texas, about 1,000 km across. B) the size of our Moon, about 3,000 km across. C) as big as Jupiter, around 100,000 km wide. D) the size of Earth, around 12,000 km across. E) the size of a city, 20-30 kilometers across.
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is __________
Fill in the blank(s) with correct word
What is the equivalent resistance between points A and B in the figure when R = 10 ??
a.
20 ?
b.
10 ?
c.
25 ?
d.
15 ?
e.
3.2 ?