Which of the above substances would have the lowest boiling point?
A) a
B) b
C) c
D) All boil at the same temperature.
E) All are gases.
Answer: A
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Which of the following is a safe assumption about all the stars in a star cluster?
A) They all have approximately the same surface temperature. B) They are all approximately the same distance away from us. C) They all have approximately the same mass. D) They will all have approximately the same lifetimes. E) They all have approximately the same apparent brightness in our sky.
An annular solar eclipse occurs
A. when the Moon in its orbit is closest to Earth, and, so not able to cover the complete disk of the Sun. B. every year when the Sun is highest in the sky. C. when the Moon in its orbit is farthest from Earth, and, so not able to cover the complete disk of the Sun. D. None of these choices is correct.
A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Where is the object for this image?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror E) 20 cm behind the mirror
A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
