An airplane is pointed at 45° north of east and is moving at 71 m/s with respect to the air. The jet stream (moving air) carries the plane at 30 m/s toward the east
What are the magnitude and direction of the velocity of the plane relative to the ground?
94 m/s at 32° north of east
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If we increase the brightness of violet light shining on a photosensitive surface we also increases the
A) number of electrons ejected per second. B) kinetic energy of the ejected electrons. C) threshold frequency. D) time lag between the absorption of blue light and ejection of electrons. E) none of the above
Suppose NASA wants a satellite to revolve around Earth 5 times a day. What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg)
A) 1.44 × 107 m B) 0.69 × 107 m C) 7.22 × 107 m D) 2.11 × 107 m
If you change the magnetic field inside a closed loop of wire, you induce in the loop
A. all of these B. a current C. a voltage D. an electric field
Which of the following particles is most similar to an electron?
A) photon B) muon C) quark D) proton E) neutrino