The Earth's orbit is closest to the Sun in January and farthest from the Sun in July. When is the Earth moving the slowest in orbit?
a. Neither January nor July since the orbital speed of the Earth is a constant.
b. January
c. July
d. This occurs twice a year, in April and in October.
C
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Determine the black body radiation emitted in the bandwidth ?1 = 0.2 ?m to ?2 = 5.0 ?m from a surface at a temperature of, (a) 100ºC, (b) 1000ºC, and (c) 3000ºC.
What will be an ideal response?
The frequency of a periodic wave is 340 Hz. The period of the vibration motion of the wave is
A. 2.56 milliseconds. B. 2.94 milliseconds. C. 3.55 milliseconds. D. 3.94 milliseconds. E. 4.25 milliseconds.
A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer annually?
A) $116.80 B) $1168.00 C) $14.60 D) $16.80 E) $146.00
A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground
a. 44 m b. 14 m c. 74 m d. 30 m e. 60 m