What is the maximum angular magnification of a magnifying glass of focal length 10 cm? (Assume the near point is at 25 cm.)
What will be an ideal response?
3.5
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Which of the following choices is not a way by which we can study the inside of the Sun?
A) We can send a space probe into the Sun's photosphere. B) We can probe the interior of the Sun by studying the vibrations in its photosphere. C) We can make a computer model of the Sun's interior that allow us to predict the observable properties of the Sun. D) We can study solar neutrinos.
A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2. Determine the tension in the string.
A. 11 N B. 70 N C. 48 N D. 59 N E. 62 N
Name four properties of Mars that are different from those of Earth today.
a. No magnetic field; lower density; thin atmosphere of mostly ; no plate tectonics. b. No magnetic field; lower density; no atmosphere; old cratered surface. c. No differentiation of interior; slow rotation; thin atmosphere of mostly ; no plate tectonics. d. No differentiation of the interior; slow rotation; no atmosphere; old cratered surface.
A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners
In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 1.0 × 106 V B) infinite C) 1.0 × 105 V D) 0 V E) 1.0 × 104 V