Motional Emf: An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T. What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
Fill in the blank(s) with the appropriate word(s).
0.32 mV
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On an axis in which moving from right to left is positive, what is the displacement and distance of a student who walks 32 m to the right and then 17 m to the left?
a. Displacement is -15 m and distance is -49 m. b. Displacement is -15 m and distance is 49 m. c. Displacement is 15 m and distance is -49 m. d. Displacement is 15 m and distance is 49 m
Lens-Maker Formula: A certain camera uses a double-convex lens made of glass with an index of refraction of 1.60. This lens has a radius of curvature of magnitude 12 cm for the first surface and one of magnitude 24 cm for the second surface. What is the focal length of this lens?
Fill in the blank(s) with the appropriate word(s).
How do we most accurately measure the distance to the Moon?
A. We measure the lunar period and use Kepler's Third Law. B. We measure its angular size and compare it to its actual diameter, which gives us its distance. C. We bounce a pulse of light off the lunar surface and measure how long the trip takes. D. We know how long it took Apollo astronauts to get there, and how fast the rocket traveled. E. All of these choices provide equally accurate measurements.
Imagine an astronaut falling into a black hole. Describe the effects that the astronaut would experience firsthand, and the changes that an external observer would see
What will be an ideal response?