A farmer is applying compressed nitrogen to a field from a tank originally at 800 kPa. The temperature of the nitrogen as it leaves the tank is approximately:
(A) ?140°C
(B) ?120°C
(C) ?100°C
(D) ?80°C
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As one stretches a metal wire, which condition is reached first?
A) the breaking point B) the proportional limit C) the elastic limit
An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball. B) heavier iron ball. C) both hit at the same time. D) not enough information
The major impact in the Yucatan wiped out the dinosaurs:
A) about 450 million years ago. B) about 200 million years ago. C) about 65 million years ago. D) about 36 million years ago. E) less than 2 million years ago.
An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 and the total mass of the two stars is 26 solar masses. What are the masses of star A and star B?
a. Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. b. Star A has a mass of 20 solar mass and star B has a mass of 6 solar masses. c. Star A has a mass of 31.2 solar mass and star B has a mass of 5.2 solar masses. d. Star A has a mass of 22.3 solar mass and star B has a mass of 3.7 solar masses. e. The masses of star A and star B cannot be determined from the information given.