The alkali metals have ______________ valence electron(s)
Fill in the blank(s) with correct word
1
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Radio maps of our galaxy show spiral arms because
a. the arms have larger Doppler shifts. b. the gas in the spiral arms is very hot. c. the dust in spiral arms is denser. d. the gas in spiral arms is denser. e. the stars in the spiral arms emit most of their energy at radio wavelengths.
Satellite Motion: The captain of a spaceship orbiting planet X discovers that to remain in orbit at 410 km from the planet's center, she needs to maintain a speed of 68 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.8 × 1019 kg B. 4.2 × 1017 kg C. 2.8 × 1016 kg D. 4.2 × 1014 kg
On a Hertzsprung-Russell diagram, where would we find stars that are cool and dim?
A) upper right B) lower right C) upper left D) lower left
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
a.
48 mJ
b.
27 mJ
c.
37 mJ
d.
19 mJ
e.
10 mJ