Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 ?. When they are connected in parallel, their equivalent resistance is 3.3 ?. What are the resistances of these resistors?
What will be an ideal response?
Answer: 4.9 Ω and 10 Ω
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The output voltage of a power supply is V = Vo sin (120. t) volts. At t = 0.010 s the output voltage is 4.2 V. What is the rms voltage of the generator?
What will be an ideal response?
A solid metal wire has a certain resistance. It is heated and carefully stretched to form a longer, thinner wire. After it cools, the resistance is _______ than it was before
a. greater b. less c. no more d. lighter
What is the primary source of energy for protostars (that have not yet become hot enough for fusion in their cores)?
A) fission from concentrated radioactive elements B) high-energy photons from nearby stars C) gravitational contraction D) the conversion of mass into energy in accord with E = mc2
If you double the energy content of a kilogram of gas, the temperature of the gas
A. is unchanged B. increases by the square-root of 2 C. doubles D. is multiplied by 4