Banked Curves: Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger-radius curve?
A. v /
B. 2v
C. v
D. v/2
Answer: C
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Conversion of Units: A typical ruby-throated hummingbird is 8 cm long. Express its length in millimeters and micrometers (µm).
A. 80 mm; 800 µm B. 80 mm; 80,000 µm C. 800 mm; 0.008 µm D. 800 mm; 0.8 µm E. 0.8 mm; 8000 µm
What does the constellation Cygnus consist of?
A) All the bright stars that lie inside the illustration of a swan on star maps. B) All of the stars and other objects that lie inside the agreed upon boundary lines. C) The stars inside of the Summer Triangle. D) About 9 stars connected by two imaginary lines. E) The star Deneb.
The xy plane is "painted" with a uniform surface charge density which is equal to 40 nC/m2 . Consider a spherical surface with a 4.0-cm radius that has a point in the xy plane as its center. What is the electric flux through that part of the spherical surface for which z > 0?
a. 14 N / m2/C b. 11 N / m2/C c. 17 N / m2/C d. 20 N / m2/C e. 23 N / m2/C
Huygen's Principle only applies to
A. electromagnetic waves. B. water waves. C. sound waves. D. all of these choices are correct