The sum of orthogonal vectors V1 and V2 is (4i 2 8j 1 7k). A unit vector along V1 is (0.635i 1 0.773j). Vector V1 is:
(A) 0.635i 1 0.773j
(B) 21.635i 1 2.773j
(C) 22.35i 22.82j
(D) 2.57i – 1.73j
(C) 22.35i 22.82j
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Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires an accurate clock, but latitude does not. B) Determining longitude requires mathematical techniques that were not known at the time. C) Determining longitude requires much more precise measurements of angles in the sky than does latitude. D) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not.
Which of the following is TRUE?
A. Mercury has a very thick atmosphere made mostly of carbon dioxide. B. Venus has no volcanos on its surface. C. Mercury rotates exactly one and a half times for every one revolution around the Sun. D. The runaway greenhouse effect causes the present temperatures on Mars to exceed those on Earth. E. The average surface temperature of Venus is about 30 degrees Fahrenheit.
A section of DNA that corresponds to a particular protein is known as a
A) codon B) chromosome C) gene D) genome
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second)
What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei. B) There are equal numbers of cobalt-60 and strontium-90 nuclei. C) There are more cobalt-60 than strontium-90 nuclei. D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.