If one lawn mower causes an 80-dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point
a. 92 dB b. 84 dB
c. 86 dB d. none of the above
c
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Bricks have been made for centuries by baking them in direct sunlight. Determine the time required to complete the baking if water is driven off at 95ºF and it requires 7000 Btu for each brick. Each brick is 4 inches by 6 inches by 8 inches and the surface emissivity is 0.4.
What will be an ideal response?
What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many long, tall cliffs B) the presence of many impact craters C) the characteristics of the Caloris Basin D) Mercury's unusually high density
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the capacitor is
A) greater than the battery's terminal voltage. B) equal to the battery's terminal voltage. C) less than the battery's terminal voltage, but greater than zero. D) zero.
Three cars (car F, car G, and car H) are moving with the same velocity, and slam on the brakes. The most massive car is car F, and the least massive is car H
Assuming all three cars have identical tires, which car travels the longest distance to skid to a stop? A) They all travel the same distance in stopping. B) Car F C) Car G D) Car H