What type of decay changes only the energy of a nucleus and not its identity?
a. Positron
b. Alpha
c. Gamma
d. Beta
c
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Potential of Point-Charges: Two 3.0 ?C charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 11,000 V B. 9000 V C. 14,000 V D. 3400 V
Power: An ac signal is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the frequency of the ac signal?
A. 160 Hz B. 200 Hz C. 410 Hz D. 600 Hz E. 910 Hz
An electric heater draws an average power of 1100 watts when plugged into a 110 V rms outlet. Calculate the resistance of the heater and the rms current.
A. 11 ?, 10 A (rms) B. 110 ?, 10 A (rms) C. 10 ?, 11 A (rms) D. 10 ?, 110 A (rms) E. 0.09 ?, 11 A (rms)
You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s
A) 6.96 m B) 20.2 m C) 22.9 m D) 18.8 m E) 20.0 m