Scale the Milky Way down to the size of a compact disc. Which of the following best describes the size, shape, and distance of the Andromeda Galaxy on the same scale?
A) a compact disk a few meters away
B) a pecan nut about 1 centimeter away
C) a grapefruit about 1 kilometer away
D) a grapefruit a few meters away
E) a compact disk about the length of a football field away
A
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A crack is 1 mm long and has a 1-nm radius of curvature at the crack tip. What is the magnitude of the stress concentration factor for this crack?
(a) 2 (b) 20 (c) 200 (d) 2000
In 2005, researcher Woo-suk Hwang reported that he had made immortal stem cells from human patients. His research was hailed as a breakthrough for people affected by degenerative diseases, because stem cells may be used to repair a person's own damaged tissues. Hwang published his results in a peer-reviewed journal. In 2006, the journal retracted his paper after other scientists discovered that
Hwang's group had faked their data. Does the incident show that results of scientific studies cannot be trusted? Or does it confirm the usefulness of a scientific approach, because other scientists discovered and exposed the fraud? What will be an ideal response?
Brewster's Angle: Find Brewster's angle for light in air that is reflected from the top of a water surface. The index of refraction of the water is 1.33.
A. 53.1° B. 36.9° C. 56.3° D. 60.2° E. 90.0°
The meter is presently defined as
a. one ten-millionth of the diameter of Earth. b. the wavelength of a line in the spectrum of krypton-86. c. the length of a platinum-iridium bar. d. the distance light travels in a vacuum in a very short time.