If a star has a parallax of 0.05", then its distance in light-years is about
A) 6.4 light-years.
B) 12.7 light-years.
C) 20 light-years.
D) 65 light-years.
E) 100 light-years.
D
Physics & Space Science
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A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
A. +0.29 kJ B. ?0.29 kJ C. +30 J D. ?30 J E. ?50 J
Physics & Space Science
In the Northern Hemisphere, air rushing into a low-pressure region
A) spirals in a clockwise direction. B) sinks. C) spirals in a counterclockwise direction. D) rises.
Physics & Space Science
Calculate the radius in nanometers of the Bohr orbit of a hydrogen atom's electron with n = 6
Physics & Space Science
The speed of a wave is the same as the speed of the particles displaced by the wave
Indicate whether the statement is true or false
Physics & Space Science