Vision Problems: A person's hyperopic (farsighted) eye can focus on objects that are 75 cm away and farther. What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?
Fill in the blank(s) with the appropriate word(s).
2.7 diopters, 38 cm
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Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know?
A) It is a spiral galaxy because we can see a dusty disk going across the center. B) It is a spiral galaxy, and we know because photos of this same galaxy from above show its spiral arms. C) It is an elliptical galaxy because it is elliptical in shape. D) It is an elliptical galaxy because it looks red/yellow in color.
A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the average acceleration of the ball during this time interval?
What will be an ideal response?
Energy in Capacitors: When a 4-?F capacitor has a potential drop of 20 V across its plates, how much electric potential energy is stored in this capacitor?
A. 0.8 ?J B. 8 ?J C. 80 ?J D. 800 ?J E. 8000 ?J
Newton's Second Law in 1 Dimension: On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?
A. 2.5 m/s2 B. 2.0 m/s2 C. 1.5 m/s2 D. 1.0 m/s2