According to Faraday's law, a coil in a strong magnetic field must have a greater induced emf in it than a coil in a weak magnetic field
A) True
B) False
B
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A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 67 m. A time interval of 100 s on the spaceship would be measured by the observer to be which of the following?
a. 200 s c. 50 s b. 150 s d. 100 s
A baseball with mass 0.14 kilograms and speed 40 m/s is caught. If all of its kinetic energy is converted to internal energy as it is caught, what is its temperature change? (Assume the baseball's specific heat capacity is 1,000 joules per kilogram degree Celsius.)
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
Jeff throws a ball straight up. For which situation is the vertical velocity zero?
a. on the way up b. at the top c. on the way back down d. none of the above