Lenz's Law: A bar magnet is close to a solenoid, as shown in the figure. As viewed through the solenoid looking toward the magnet, what is the direction (clockwise or counterclockwise) of the current (if any) induced in the solenoid in each case?(a) The magnet is pushed toward the solenoid.(b) The magnet and solenoid both move to the right at 25 cm/s.
What will be an ideal response?
(a) counterclockwise (b) no induced current
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A good heat conductor is
A) a poor insulator. B) a good insulator. C) neither of these
Mass on a Spring: A mass on a spring undergoes SHM. When the mass is at its maximum distance from the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A. Its acceleration is zero. B. Its speed is zero. C. Its elastic potential energy is zero. D. Its kinetic energy is a maximum. E. Its total mechanical energy is zero.
A two-shell-eight-tube-pass heat exchanger is used as an economizer by heating a 1000 l/min 10ºC stream of water with another 1000 l/min stream of 75ºC water. If the NTU value for the economizer is 0.45, what are the outlet temperatures of the two streams of water?
What will be an ideal response?
How fast do tectonic plates move on Earth?
A) quite fast, but only during earthquakes B) a few centimeters per century C) a few centimeters per year D) a few kilometers per century E) about 1 mile per hour