A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2 . If P is increased to 5.0 N, determine the magnitude of the block's acceleration
a. 2.1 m/s2
b. 2.3 m/s2
c. 1.9 m/s2
d. 1.7 m/s2
e. 3.2 m/s2
D
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Why do models suggest that Uranus and Neptune formed elsewhere?
A) We do not have very good models. B) The density of materials was too low in their current orbits for the ice giants to have formed there. C) Jupiter and Saturn took up most of the material in the area; Uranus and Neptune must have formed elsewhere. D) It is too cold at their current locations for the ice giants to have formed there.
Astronomer's believe that a spiral galaxy may form:
A) from a collision between a small and large galaxy. B) due to a quasar shutting down. C) from the sudden contraction of an elliptical galaxy. D) from the collision of two giant elliptical galaxies. E) from the explosion of a dwarf irregular galaxy.
The difference between a DC and an AC generator is that
a. the DC generator has one unbroken slip ring. b. the AC generator has one unbroken slip ring. c. the DC generator has one slip ring split in two halves. d. the AC generator has one slip ring split in two halves. e. the DC generator has two unbroken slip rings.