A car travels 20 km west and then 20 km south. What is the magnitude of its displacement vector?
A) 20 km B) 0 km C) 40 km D) 28 km
D
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The method of standard candles can be used to measure a star's ________.
A. luminosity B. brightness C. mass D. distance E. absolute magnitude
Quasars may come from mergers of black holes in early galaxies
Indicate whether the statement is true or false
What is the minimum uncertainty in determining the position of an electron if the speed of the electron is 6.0 km/s within an accuracy of 0.0040%? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 0.11 mm B) 0.24 mm C) 0.34 mm D) 0.15 mm E) 0.48 mm
The focal length of a glass lens depends on
A. both the index of refraction of the glass and the intensity of the light passing through the lens. B. the curvature of the surface of the lens. C. the index of refraction of the glass. D. both the curvature of the surface of the lens and the index of refraction of the glass. E. the intensity of the light passing through the lens.