Which of the following processes will increase the mass of the system?
A) A rock is made to move faster and faster.
B) Two magnets that are initially held together by their magnetic forces are separated.
C) Both of the above.
D) A cup of coffee is heated.
E) All of the above.
E
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The back emf of an electric motor is greatest
A. when the motor is just starting up. B. when the motor is halfway to operating speed. C. when the motor is at 71% of the operating speed. D. when the motor is at full operating speed. E. at all times since it is a constant when the motor is running at any speed.
Heat (Q) is the amount of _____________that is transferred from an area at high temperature to an area at low temperature.
Fill in the blank(s) with the appropriate word(s).
A concave mirror has a focal length of 20 cm. What is the magnification if the object and image distances are 10 cm and ?20 cm, respectively?
A. 1 B. 2 C. 1/2 D. 1/4 E. ?1/2
The mirror on the passenger side of modern automobiles is a ___________ mirror
a. convex b. concave c. plane d. spherical