Spherical Mirrors: A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A. -4.1 cm
B. +20 cm
C. -9.9 cm
D. -20 cm
E. +9.9 cm
Answer: C
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Center of Mass: Three small masses are positioned as follows: 2.0 kg at (0.0 m, 0.0 m), 2.0 kg at (2.0 m, 0.0 m), and 4.0 kg at (2.0 m, 1.0 m). Determine the coordinates of the center of mass (or center of gravity) of this system.
A. (0.50 m, 1.5 m) B. (1.5 m, 0.50 m) C. (2.5 m, 1.5 m) D. (2.5 m, 0.50 m)
Charge in an Electric Field: What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass 2.1 g that has been charged to -3.0 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 6.9 × 106 N/C B. 7.8 × 105 N/C C. 1.5 × 106 N/C D. 2.1 × 106 N/C
If you stood on a planet having a mass four times that of Earth's mass, and a radius two times that of Earth's radius, the gravitational force that the planet exerts on you would be
A) the same as Earth exerts on you. B) two times more than Earth exerts on you. C) two times less than Earth exerts on you. D) four times more than Earth exerts on you.
The transmission of sensible heat through matter by transfer of energy from one atom or molecule in the direction of decreasing temperature is:
What will be an ideal response?