Two objects made from the same material have different masses and different initial temperatures as shown. If the bodies are placed in thermal contact, the final equilibrium temperature is most nearly:
4
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Which of the following statements about the force attracting these two galaxies is true?
A) It is the same force that causes an apple to fall to the ground. B) It is a force unlike any force that we ever experience on Earth. C) It is a mysterious force, whose nature remains completely unknown to scientists. D) The force will get weaker as time passes.
Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 ?C at x = 0, +20 ?C at x = 40 cm, and ?60 ?C at x = 60 cm, what is the magnitude of the electrostatic force on the +32-?C charge?
a. 84 N b. 12 N c. 36 N d. 50 N e. 48 N
A spherical volume of space has an electric field of intensity 130 N/C directed radially outward from it surface of radius 0.4 m. What is the net charge enclosed within this surface? (?0 = 8.85 × 10^–12 F/m)
a. 3.5 nC b. 2.3 nC c. –3.5 nC d. –2.3 nC e. 0 nC
How did ancient Greeks such as Aristotle know that Earth is round?
A) From the ancient manuscripts of authors such as Homer. B) By noting that ships drop below the horizon as they go out to sea. C) By triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) Careful measurements of the distance, along Earth's surface, between two widely separated points showed it to be longer than the straight-line distance. E) Actually, the ancient Greeks thought that Earth is flat.