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.
C
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The reinforcing material with the highest strength available for composites is
(a) Whiskers (b) Graphite fibers (c) SiC fibers (d) OUHMWPE
Which of the following statements about the first stars that were born in the universe is expected to be true?
A) They were made only from hydrogen and helium. B) They were made from pure energy. C) They were probably orbited only by terrestrial planets but no jovian planets. D) They were made approximately of 98% hydrogen and helium and 2% of heavier elements.
Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also c. the work increases b. the work stays the same d. none of the above
The internal energy of n moles of an ideal gas depends on
a. one state variable T. b. two state variables T and V. c. two state variables T and P. d. three state variables T, P and V. e. four variables R, T, P and V.