What does a refracting telescope use to gather and focus light?
a. eyepiece
b. mirror
c. lens
d. photometer
e. active optics
c
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Energy and Mass: If the mass of a 1.0-kg book could be entirely converted into electrical energy, how many kW ? h of energy would that generate? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Which of the following gives evidence of the solar wind?
A. the tails of comets B. solar flares C. solar prominences D. sunspots E. jet streams on Earth
An AC series circuit has 18.9-? resistance, 21.1-? inductive reactance, and 15.5-? capacitive reactance. If an effective (rms) emf of 94 V is applied, what is the power output?
a. 2.34E+2 W b. 1.60E+2 W c. 4.66E+2 W d. 4.30E+2 W e. 2.32E+2 W
A sunbather on the clear day is receiving about 500 watts of solar power
Indicate whether the statement is true or false