Earth is a noninertial reference system:
a. only because it rotates.
b. only because it revolves.
c. only because of the movement of the Milky Way Galaxy.
d. only because of the motion of the Moon.
e. because of all the various ways it moves, including rotation, revolution, and the movement of the Galaxy.
e
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If the number of turns on the transformer input is greater than the number on the output, then the transformer
A. outputs greater voltage than at the input. B. outputs less current than at the input. C. outputs greater voltage and current than at the input. D. outputs less voltage than at the input. E. increases the voltage but does not affect the current.
A billiard ball is moving in the x direction at 40.0 cm/s and strikes another billiard ball moving in the y direction at 30.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0 c. some negative value b. some positive value d. No answer above is correct.
Three point charges, two positive and one negative, each having a magnitude of 20 mC are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges?
a. 69 N b. 40 N c. 80 N d. 57 N e. 20 N
When a star collapses to become a black hole, its mass
A) increases. B) decreases. C) remains unchanged.