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

Physics & Space Science

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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

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Which of the following particles is most similar to an electron?

A) photon B) muon C) quark D) proton E) neutrino

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science