How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
a. 3.3 × 10^?6 J
b. 3.3 J
c. 0.003 J
d. 10?4 J
e. 3.0 × 10^5 J
a
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A long, vertical, metallic wire carries downward electric current. What would be the direction of the field if the current consisted of positive charges moving downward instead of electrons moving upward?
1.north 2.south 3.east 4.west 5.up
Positively charged particles in an atom are called ________.
A. electrons B. protons C. neutrons D. positrons E. neutrinos
Which is the most massive star?
A. Star of 0.5 solar masses B. Coolest possible main sequence star C. Type B main sequence star D. Type G main sequence star E. Hottest possible main sequence star
The most luminous quasars can give off ________ times more light than our own Galaxy
Fill in the blank(s) with correct word