An electric toaster operating on 120 volts draws a current of 6 amperes. The resistance of the toaster is
a. 0.05 ohms c. 720 ohms
b. 20 ohms d. none of the above
B
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Acceleration: A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration?
Fill in the blank(s) with the appropriate word(s).
When using rays to represent the direction of light, these are drawn
A. perpendicular to the wavefronts B. parallel to the wavefronts C. so they have no relation to the wavefronts
The 3 K background radiation is just the redshifted gamma wavelength radiation of the decoupling
Indicate whether the statement is true or false
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.)