The preferred positive direction for angular displacement is the clockwise direction
Indicate whether the statement is true or false
FALSE
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The Virgo cluster
a. is the galactic cluster that contains the Milky Way. b. is the oldest known cluster of galaxies. c. is located at the center of the universe. d. contains mostly spiral galaxies and very few elliptical galaxies. e. is a rich cluster and the closest cluster of galaxies outside of the Local Group.
Impulse: A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.050 s. What is the magnitude of the average force exerted on the wall by the ball?
A. 800 N B. 400 N C. 55,000 N D. 27,500 N E. 13,750 N
In a p-type semiconductor, a hole is
A) an extra proton supplied by a donor atom. B) an extra electron supplied by a donor atom. C) a donor atom. D) a region where an electron is missing. E) a missing atom in the crystalline structure.
Elementary Particles: What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?