You carry a 7.0-kg bag of groceries above the ground at constant speed across a room. How much work do you do on the bag in the process?
A) 0.00 J
B) 82 J
C) 185 J
D) 157 J
A
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Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies
What will be an ideal response?
Intensity: Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions.
A. 3.78 W/m2 B. 4.36 W/m2 C. 47.6 W/m2 D. 54.7 W/m2
Fundamental Forces: How does the range of an exchange force depend on the mass of the exchange particle?
A. The range is longer for a massive exchange particle than for a light exchange particle. B. The range is shorter for a massive exchange particle than for a light exchange particle. C. The range does not depend on the mass of the exchange particle.
A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
a. 16 N b. 27 N c. 32 N d. 11 N e. 3.0 N