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Let's say you take an ordinary wire coat hanger and straighten out the hook shaped part that normally hangs over the coat rack. Now, you can spin the (roughly) triangular part around by twisting the straightened part between your fingers. Estimate the EMF that you can generate by spinning the hanger in the Earth's magnetic field (about 5 x 10-5 T).
A golfer rides in a golf cart at an average speed of 3.63 m/s for 32.3 s. She then gets out of the cart and starts walking at an average speed of 1.16 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and w..
Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.450 m at the rate of 10.0 rev/s. What is the speed of the stone for each rate of rotation
A small statue has a height of 3.5 cm and is placed in front of a concave mirror. The image of the statue is inverted, 1.5 cm tall, and located 12 cm away from the mirror. Find the focal length of the mirror.
light from a helium - neon laser is shinedon a slit of width 0.02mm. Describe qualitatively the pattern of light seen on ascreen 1.0 meter away. and how would the pattern be different if the slit were 0.06mmwide instead of 0.02mm?
A coin 2.1 cm in diameter is held 25 cm from a concave spherical mirror of 28 cm radius of curvature. What is the diameter of the image
A 2.00-nF capacitor with an initial charge of 5.06 µC is discharged through a 1.28-k? resistor. What is the maximum current in the resistor
A 795 kg car moving at 26 m/s brakes to a stop. The brakes contain about 15 kg of iron, that absorbs the energy. What is the increase in temperature of the brakes.
A circular coil of wire with 200 turns and a radius of 30 cm is laying flat on a horizontal wooden table. find the magnitude of the magnetic flux through the coil
A point on the rim of a 0.25-m-radius rotating wheel has a centripetal acceleration of 4.0 m/s^2. What is the angular speed of the wheel
suppose the apparatus as used in this lab: A cube of mass M = 500 g and side length 30 mm is free to spin on an axis through the center of one face. A massless pulley on this axis has a diameter of 2r = 10 mm. An object with m = 50 g is hung from ..
A supertanker (mass 1.70 x 10^8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.40 X 10^5 N. Determine a) the magnitude of the resistive force exerted on the tanker by water and b) the magnitude of the upward buoyan..
A rifle with a weight of 35 N fires a 5.0-g bullet with a speed of 250 m/s, If a 675-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
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