A red-hot piece of coal will cool quicker in a
A) cold room.
B) warm over.
C) both the same.
Answer: A
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The circumferential strain in the wall of the tank is approximately:
(A) 1.9 3 1024
(B) 3.2 3 1024
(C) 3.9 3 1024
(D) 4.5 3 1024
The most important highlight of Precambrian Time was the
A) explosion of life. B) asteroid impact that resulted in the formation of our Moon. C) accumulation of free oxygen in the atmosphere. D) emergence of reptiles.
Which of the following is true about irregular galaxies?
A) They are composed solely of old stars. B) They generally have significant bulge populations. C) They were more common when the universe was younger. D) They have reddish colors. E) They have well-defined spiral arms.
A 2.3 cm tall statue is 15. cm in front of a convex mirror. The mirror radius of curvature is 18. cm
(a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How high is the image?