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Bats are capable of navigating using the earth's field-a plus for an animal that may fly great distances from its roost at night. If, while sleeping during the day, bats are exposed to a field of a similar magnitude but different direction than the earth's field, they are more likely to lose their way during their next lengthy night flight. Suppose you are a researcher doing such an experiment in a location where the earth's field is 50µT at a 60°angle below horizontal. You make a 50cmdiameter, 100-turn coil around a roosting box; the sleeping bats are at the center of the coil. You wish to pass a current through the coil to produce a field that, when combined with the earth's field, creates a net field with the same strength and dip angle (60° below horizontal) as the earth's field but with a horizontal component that points south rather than north.
A sanding disk with rotational inertia 8.1 x 10-3 kg·m2 is attached to an electric drill whose motor delivers a torque of magnitude 20N·m about central axis of the disk. About that axis and with torque applied for 29 ms, what is the magnitude of (..
A rocket is projected upward from the earth's surface (r = RE) with an initial speed v0 that carries it to a distance r = 1.4 RE from the center of the earth. What is the launch speed
a spherical ball with a radius of 1.440times10-1m is completely submerged in a fluid that has a density of
The engine delivers 160 hp to an aircraftpropeller at 2100 rev/min. How much torque does the aircraft engine provide
A microscope is focused on a black dot. When a 1.15 cm-thick piece of plastic is placed over the dot, What is the index of refraction of the plastic
A cork shoots out of a champagne bottle at an angle of 35.0 degree above the horizontal. what was its initial speed
your friend has been given a laser for her birthday. unfortunately she did not receive a manual with it and so she
at a distance from a point charge the electric potential is 3200 and the magnitude of the electric field is 2.0times105
A man of mass 65 kg falls stiff-legged straight down from a height of 2m. He lands on one foot. The femur is a bone in the leg with the length L=.65m, and a cross-sectional area of about 2.0 x 10^-4m^2. The Young's modulus for bone is 9.4x 10^9 N/..
A 50,000 kilogram railroad car moving at 4.0 m/s overtakes and couples with a second car of mass 60,000 kilogram that is initially moving at 2.0 m/s on the same track. Find the speed of the two cars after they are coupled
Sam walks 0.40 kilometer in a direction 60.0o west of north, then goes 0.50 kilometer due west. Determine what is his displacement
A stone is dropped at t = 0. A second stone, with twice the mass of the first, is dropped from the same point at t = 179 ms. How far below the release point is the center of mass of the two stones at t = 386 ms
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