A flux of 4 × 10-5 Wb is maintained through a coil for 0.5 s. What emf is induced in this coil by this flux?
A) No emf is induced in this coil.
B) 2 × 10-5 V
C) 8 × 10-5 V
D) 6 × 10-5 V
E) 4 × 10-5 V
A
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Claims that appear to be pseudoscience should be
A. accepted if it is said to have scientific validity B. tested experimentally C. accepted if promoted by news media D. all of the above
Which of the following statements does not lend support to the idea that carbon dioxide is a cause of global warming?
A) Models of the greenhouse effect successfully predict the actual temperatures of Mars and Venus from their atmospheric carbon dioxide amounts. B) Models of Earth's climate that include recent increases in carbon dioxide concentration match the observed temperature increases better than those that do not include it. C) We understand the physical mechanism of the greenhouse effect, by which carbon dioxide increases cause an increase in the planet's temperature. D) Isotope ratios in atmospheric carbon dioxide show that much of the carbon dioxide in Earth's atmosphere today comes from the burning of fossil fuels.
Which has the larger kinetic energy, a 50-kg person running at a speed of 2 m/s, or a 5-g nickel falling at a speed of 200 m/s?
A. The running person B. The falling nickel C. Both have about the same kinetic energy.
Which of the following is not a dwarf planet?
a. Ceres b. Mercury c. Pluto d. Eris