A huge vehicle that moves at 50 km/h skids 20 m with locked brakes. How far will it skid if its initial speed were three times as much?
A. 180 m.
B. 60 m.
C. 90 m.
D. need more information
Answer: A
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A lamp rated 23W 120V means that it will deliver 23 W
A. whether or not it is connected to 120 V. B. when the voltage across it is 120 V. C. as long as the current is ac. D. none of the above
The infant mortality rate for a country is defined as:
A. the percentage of infants who perish at birth. B. the number of female infants killed, due to preference for males. C. the number of abortions, stillbirths, and accidental deaths in a given year. D. the number of infant deaths per 1000 live births during the first year of life.
Which of the following are ways in which a geologist may determine the density of earth materials?
A. by measuring the different velocities of seismic waves B. through direct measurement in the laboratory C. using instruments to measure the pull of gravity D. All of these choices are correct.
Which of the following statements is about tsunami in the deep ocean?
A. They only "feel" the bottom if it is less than 4,000 meters deep. B. They never "feel" the bottom. C. They only "feel" the bottom if it is less than 3,000 meters deep D. They are always "feeling" the bottom. E. They only "feel" the bottom if it is less than 5,000 meters deep.