A reason for electric shielding inside a conductor is that any free electrons inside would

A) not obey the inverse-square law.
B) cancel one another.
C) be set in motion until equilibrium is established, on the outside.
D) all of the above
E) none of the above


Answer: C

Physics & Space Science

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A laser beam passes through a thin slit. When the pattern is viewed on a screen 1.25 m past the slit, you observe that the fifth-order dark fringes occur at ±2.41 cm from the central bright fringe

The entire experiment is now performed within a liquid, and you observe that each of the fifth-order dark fringes is 0.790 cm closer to the central fringe than it was in air. What is the index of refraction of this liquid? A) 1.33 B) 1.40 C) 1.49 D) 1.62 E) 3.05

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As shown in the above image, rising material is flowing from the penumbra and into the umbra where it sinks



a. True
b. False

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The rear-view mirrors on the passenger side of many new cars have a warning written on them: "OBJECTS IN MIRROR ARE CLOSER THAN THEY APPEAR." This implies that the mirror must be

A) concave. B) plane. C) convex. D) transparent.

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A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. The cars latch together and move off with a speed of 1.2 m/s. How fast was the first car moving before the collision?

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