Why doesn't a car driven at 200 km/h emit twice as much pollution in a 400 km trip as a car traveling at 100 km/h?
What will be an ideal response?
The drag force depends on the square of the speed; the faster car will emit
roughly four times as much pollution as the slower car.
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Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 50 kHz, and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect?
a. 1.5 mm c. 5.5 mm b. 3.7 mm d. 6.6 mm
Bulk Modulus: Two solid spheres are made from the same material, but one has twice the diameter of the other. Which sphere will have the greater bulk modulus?
A. the larger one B. the smaller one C. It will be the same for both spheres.
The only spacecraft to successfully land on Venus were:
A) ESA's Giotto. B) Russian Veneras. C) NASA's Vikings. D) NASA's Magellan. E) NASA's Venus Rovers.
The water behind Grand Coulee Dam is 1200 m wide and 160 m deep. Find the hydrostatic force on the back of the dam. (Hint: the total force = average pressure × area)
a. 5.2 × 10^9 N c. 13.2 × 10^10 N b. 8.8 × 10^10 N d. 15.1 × 10^10 N