The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?

A) 40 cm B) -10 cm C) 20 cm D) -40 cm E) -20 cm


D

Physics & Space Science

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Indicate whether the statement is true or false

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Two charged particles 1 m apart exert a 1-N force on each other. If the particles are instead 0.5 m apart, the force on each particle will be

A) 1.0 N. B) 2.0 N. C) 4.0 N. D) 8.0 N. E) 16.0 N.

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An 18-mm-wide diffraction grating has rulings of 710 lines per millimieter. Monochromatic light of wavelength 506 nm wavelength is incident normally on the grating

What is the largest angle from the centerline at which an intensity maximum is formed? A) 46° B) 40° C) 38° D) 42° E) 44°

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A power transmission line 50 km long has a total resistance of 0.60 ?. A generator produces 100 V at 70 A

In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. (a) What percentage of the original energy would be lost if the transformer were not used? (b) What percentage of the original energy is lost when the transformer is used?

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