What is the apparent path of the Sun along the celestial sphere?
a)the ecliptic
b)a eclipse
c) retrograde motion
a)the ecliptic
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Wien's Law: If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K.
Fill in the blank(s) with the appropriate word(s).
Kirchhoff's Rules: Determine the current in the 7.0-? resistor for the circuit shown in the figure. Assume that the batteries are ideal and that all numbers are accurate to two significant figures.
A. 0.28 A B. 1.3 A C. 1.6 A D. 2.1 A
When a flower petal is 4.0 cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A) 1.3 cm B) 2.0 cm C) 4.0 cm D) 5.3 cm
A farsighted person cannot see clearly closer than 2.0 m. What power contact lenses would correct this near point to 25 cm?
A. 2.0 D B. 0.5 D C. -0.5 D D. 3.5 D E. -3.5 D