A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will
A) be behind the package.
B) be over the package.
C) be in front of the package.
D) depend of the speed of the plane when the package was released.
Answer: B
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Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) The 10-pound weight will hit the ground before the 5-pound weight. B) Both will hit the ground at the same time. C) Both weights will float freely, since everything is weightless on the Moon.
How did Harlow Shapley determine the distances to globular clusters in the Milky Way galaxy?
A. He used the Period-Luminosity Relation of RR Lyrae variable stars so they could be used as standard candles. B. He used the radial velocity technique as a globular cluster orbits around a companion cluster. C.He measured the distance to the Galactic center and assumed all clusters were at that same distance. D. He used the parallax technique with a satellite designed to have a larger baseline than could be achieved from Earth. E. He used the parallax technique by viewing the clusters at two different times from the orbit of Earth.
Equal wavelength waves of amplitude 0.25 m and 0.10 m interfere with one another. What is the resulting minimum amplitude that can result?
a. 0.15 m c. 0 m b. 0.10 m d. –0.40 m
This figure shows idealized thermal radiation spectra from several stars and a human. Based on this graph, at about what wavelength does a 15,000 K star emit its most intense light?
A) about 100 nanometers B) about 1,000 nanometers C) about 20 nanometers D) about 100,000 nanometers