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College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Many roller coasters use magnetic brakes to slow the train at the end of its run. A
a. Explain the principle behind this magnetic braking.
b. The system needs an ordinary friction-based brake to bring the train to a full stop. Explain why the magnetic brake is not very efficient when the train is moving slowly.
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- What happens when you break a bar magnet in two? a.You get two separate poles. One piece will be the north pole, the other will be the south pole. b.You get two bar magnets. Each has a north and south pole. c. The poles discharge. The act of breaking the magnet allows the magnetic charge to move so as to cancel each other out the same way protons can cancel electrons with electric charge. d. You cannot have a magnet without two poles, so the pieces will no longer be magnetic.arrow_forward8. The US Navy is developing a railgun that uses magnetic field repulsion. The railgun can propel a 980 N projectile at seven times the speed of sound. How much energy is stored in this magnetic field? Assume a complete conversion of energy and a speed of sound of 340 m/s. A. 119 MJB. 283 MJC. 578 MJD. 2780 MJarrow_forward13. You have the apparatus shown in Figure P21.13. A circular metal plate swings past the north pole of a permanent magnet. The metal consists of a series of rings of in- creasing radius. Indicate the direction of the current in one ring (a) as the metal swings down from the left into the magnet- ic field and (b) as the metal swings up to- ward the right out of the magnetic field. Use Lenz's law to justify your answers. Figure P21.13 Metal plate Magnet Narrow_forward
- What is the direction of the magnetic force on a negative charge that moves as shown in the figure? B Select one: O a. In O b. there is no magnetic force O. Out O d. Left When the light is passing from rarer to a denser medium, which is the correct statement? O a. speed becomes zero O b. speed of light increases speed of light remains constant O d. speed of light decreasesarrow_forwardA charged particle moving through a magnetic field at right angles to the field with a speed of 27.7 m/s experiences a magnetic force of 2.98 10-4 N. Determine the magnetic force on an identical particle when it travels through the same magnetic field with a speed of 5.14 m/s at an angle of 27.2° relative to the magnetic field.Narrow_forwardCQ 10. Many roller coasters use magnetic brakes to slow the train at the end of its run. A conducting plate on the train passes by powerful magnets fixed on the track. a. Explain the principle behind this magnetic braking. b. The system needs an ordinary friction-based brake to bring the train to a full stop. Explain why the magnetic brake is not very efficient when the train is moving slowlyarrow_forward
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