A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 × 10-4 T
What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19 C)
1.3 × 10-20 N, toward the east
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Arrange the strong (S), electromagnetic (EM), weak (W), and gravitational (G) forces from weakest to strongest.
A. W, G, EM, S B. W, G, S, EM C. G, W, S, EM D. G, W, EM, S E. W, S, G, EM
A person is nearsighted with a far point of 75.0 cm
(a) What focal length contact lens is needed to give him normal vision? (b) What is the power of the corrective lens? What will be an ideal response?
A high-pressure zone girdles Earth at the 30°N and 30°S latitudes, causing
A) great deserts, such as the Sahara and Arabia Desert in Africa, the Mojave Desert in the United States, and the great Victoria Desert in Australia. B) hot, weak winds in the horse latitudes. C) a belt of hot and dry surface air. D) all of these
This type of sediment transport moves large particles such as sand and gravel by rolling, sliding, or bouncing them along the channel bed.
What will be an ideal response?