What is an "extrasolar planet"?
A) a planet that is extra large compared to what we'd expect
B) a planet that is considered an "extra," in that it was not needed for the formation of its solar system
C) a planet that orbits a star that is not our own Sun
D) a planet that is larger than the Sun
C
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The radiation emitted from a star has a maximum intensity at a wavelength of 500 nm. What is the temperature of this star?
a. 6,000 K b. 5,000 K c. 1.5 × 10^9 K d. 500 K e. 10,000 K
Potential: If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A. 2.3 × 107 m/s B. 1.9 × 107 m/s C. 1.5 × 107 m/s D. 1.1 × 107 m/s
A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.
A ball is thrown straight up into the air. Its position at 7 instants of time are shown in the figure; the maximum height is reached at position 4. At which of the labeled points is the acceleration of the ball smallest?