An electric circuit consists of a resistor connected across the terminals of an ac generator. How does the power dissipated in the resistor change as the frequency in the generator decreases?
A) It decreases.
B) It increases.
C) It does not change.
D) It increases or decreases depending on the sign of the phase angle.
C
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a. magnetism b. no force is needed to drive them along their orbits c. gravity d. solar wind
A person approaches a plane mirror at a speed of 2 m/s. How fast does he approach his image?
A) 1 m/s B) 2 m/s C) 3 m/s D) 4 m/s E) 1 m/s
If a radioactive isotope has a one year halflife, what fraction will remain after 5 years?
A) None B) Half C) 1/32 D) 1/5 [one fifth] E) 1/64
Telephones don't transmit frequencies above 3,400 Hz. Musical notes should sound normal over the telephone as long as they are below 3,400 Hz
a. True b. False Indicate whether the statement is true or false