If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true?
1.The circuit element is a resistor.
2.The circuit element is a capacitor.
3.The circuit element is an inductor.
4.The current and voltage are 90° out of phase.
5.The current and voltage are 180° out of phase.
4
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In the absence of an external force, a moving object will
A) stop immediately. B) slow down and eventually come to a stop. C) gradually speed up until it reaches its terminal velocity. D) move with constant velocity in a straight line. E) move with constant velocity in a circular orbit.
The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time. The threshold of hearing is 1.0 × 10-12 W/m2.What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is 1.0 × 10-12 W/m2.
A) 300 dB B) 60 dB C) 74 dB D) 67 dB E) 81 dB
The air in a pipe resonates at 120 Hz and 600 Hz, one of these resonances being the fundamental. If the pipe is open at both ends, how many resonances are between the two given ones, and if the pipe is closed at one end, how many resonances are between the two given ones?
a. open: 3; closed: 1 b. open: 1; closed: 3 c. open: 2; closed: 0 d. open: 0; closed: 2 e. open: 5; closed: 1
Which of the following are the units of a henry and a farad, respectively?
a. J ? s2/C2 and C2/J b. V ? s/A and V/C c. V/(A ? s) and C/V d. N ? m/A2 and 1/J e. None of the above