Current that is typically 60 hertz is
A) direct current.
B) alternating current.
C) either of these
D) neither of these
Answer: B
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One theory for the origin of life suggests that life was transported to Earth in meteorites. This is referred to as
A) naturism B) intelligent design C) panspermia D) chemical evolution
Galaxies sometimes have recession speeds that deviate somewhat from the exact speed predicted by Hubble's law. What do these so-called peculiar velocities reveal?
A) velocities due to the gravitational tugs of nearby galaxies or clusters of galaxies B) deviations in the rate at which the universe has been expanding at different times in the past C) These velocities indicate serious discrepancies with Hubble's law and with our view of an expanding universe. D) These velocities indicate that the expansion rate differs for different directions in space.
What is the average power dissipation in a series RC circuit if R = 5.00 k?, C = 2.00 ?F, and V = 170 cos (300t)?
a. 0.930 W b. 2.60 W c. 28.2 W d. 157 W e. 5.20 W
A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2 . For the next 20 s, the acceleration of the particle is ?1.0 cm/s2 . What is the position of the particle at the end of this motion?
a. zero b. +3.0 m c. ?1.0 m d. +2.0 m e. ?3.0 m