A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it hits and couples with a stationary 10,000-kg boxcar. What is the speed of the cars after the collision?
What will be an ideal response?
0.875 m/s
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Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease. b. The greenhouse effect would be more efficient and the temperature of Earth would increase. c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll. d. Ultraviolet radiation from the Sun would bombard Earth. e. none of the above
Modern nuclear bomb tests have created an extra high level of 14C in our atmosphere. Suppose that future archaeologists date samples from our era, but do not know about this testing
Will their dates be too young, too old, or still correct? If correct they are correct, why? A) too young B) too old C) correct, because 14C from bomb tests is different from that produced naturally D) correct, because modern biological materials do not gather 14C from bomb tests
Dean teaches that the phenomenon of regelation is due to the
A) freezing point of water. B) melting point of ice. C) open-structured nature of ice crystals. D) high specific heat of water.
The dielectric constant of a vacuum is
A) zero. B) 8.99 × 109. C) o. D) 1000. E) 1.000.