Increases in the temperature of the earth due to the greenhouse effect over the last 50 years is least due to ________
a. burning of oil by industry and utilities
b. flatulence by cows
c. addition of hot water to lakes by utilities
d. clearing land for farming
e. use of freons
c
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Intensity of Sound: A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2.
A. 79 dB B. 69 dB C. 56 dB D. 49 dB E. 36 dB
What is the horsepower needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.00 seconds?
A) 369 hp B) 36.9 hp C) 18.8 hp D) 188 hp E) 275 hp
An object 1.80 cm tall is placed 100 cm in front of a diverging lens having a focal length of magnitude 25 cm. A converging lens with a focal length of magnitude 33.33 cm is placed 30 cm past the first lens
What is the lateral magnification of this system of lenses? A) 0.40 B) -2.5 C) 2.5 D) -0.40 E) 1.0
A blue photon
A) has a smaller wavelength than a red photon and travels with the same speed. B) has a smaller wavelength than a red photon and travels with a greater speed. C) has a longer wavelength than a red photon and travels with the same speed. D) has a longer wavelength than a red photon and travels with a greater speed.