Kirchhoff's Rules: Determine the current in the 12-? resistor for the circuit shown in the figure assuming that the batteries are ideal.
A. 0.25 A
B. 0.50 A
C. 0.75 A
D. 1.0 A
Answer: A
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When you apply an alcohol swab to your skin, it feels cool because
A. the density of alcohol is less than 1 g per cm3. B. your skin transfers a bit of heat to the liquid alcohol and the alcohol evaporates. C. germs are destroyed by the alcohol, and they give off cold heat as they die. D. of nothing-it is an illusion, because evaporating alcohol is actually hotter than liquid alcohol.
Transformers: The secondary coil of an ideal neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What current does the primary draw?
A. 0.625 A B. 0.625 mA C. 0.160 A D. 1.66 A
Given 4 tuning forks of frequency 446, 440, 443, and 449 Hz, how many different beat frequencies could be produced and what are they?
What will be an ideal response?
During the volcanic eruption of Mt. Pelee in 1902, an incredibly hot "burning cloud" rolled down the mountain and incinerated the town of Saint-Pierre. From the damage done, the temperature in the cloud was estimated at 700°C. If the air temperature
was 20°C and a mole of air is 29 grams, estimate the molecular weight of the gas in the "burning cloud" that made it heavier than the surrounding air. (As a follow-on, estimate the most probable composition of the cloud. Some typical volcanic gases are H2S, SO2, H2SO4, CO2, NO.)