An object is placed 9.5 cm in front of a convex lens with a focal length of magnitude 24 cm. (a) Where is the image formed and how far is it from the lens? (b) What is the magnification produced by the lens?
What will be an ideal response?
(a) 16 cm in front of the lens (b) 1.7
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What is the average value of the magnitude of the Poynting vector 
at 1 meter from a 100-watt lightbulb radiating in all directions?
A. 1 W/m2 B. 4 W/m2 C. 2 W/m2 D. 8 W/m2 E. 12 W/m2
The ionosphere reflects
a. microwaves. b. AM radio waves. c. FM radio waves. d. x-rays.
A 3.6 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T
A force diagram, showing the four forces that act on the box in equilibrium, is shown in Figure 5.6. The force F is adjusted so that the magnitude of force T is equal to the weight w. The magnitude of force F, for which this occurs, is closest to: A) 26 N B) 27 N C) 28 N D) 29 N E) 30 N
In which city is Polaris highest in the sky?
A) Singapore B) Mexico City C) Denver D) Anchorage E) All the same, depending on the time of night