Most of the light we see coming from the sun originates in the ____________________
Fill in the blank(s) with correct word
photosphere
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If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
A. 5.0 N B. 4.4 N C. 3.8 N D. 5.7 N E. 0.60 N
John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
a. 19 m/s b. 25 m/s c. 610 m/s d. 22 m/s e. 12 m/s
The hydrogen Balmer line H? has a wavelength of 434.0 nm in the laboratory. It is observed in a quasar at 651.0 nm. In terms of the speed of light, what is the recessional velocity of this quasar?
a. 217.0 b. 2 c. 1.5 d. 0.67 e. 0.5
In a certain gas the molecules are 5.0 × 10?9 m apart on average, have a mean free path of 5.0×10?6 m, and have an average speed of 500 m/s. The rate at which a molecule has collisions with other molecules is about:
A. 10?11 s?1 B. 10?8 s?1 C. 1 s?1 D. 10^8 s?1 E. 10^11 s?1