According to the theory of cosmic inflation, the universe
A) began as the result of the "big crunch" collapse of some pre-existing universe.
B) began from a powerful electromagnetic effect in vacuum.
C) had no beginning but instead has always existed.
D) began as a tiny fragment of space and time.
E) began when two very massive pre-existing particles collided and annihilated with each other.
D
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The average force required to accelerate a 0.20-kg ball from rest to 30 m/s in 0.002 s is
A. 15,000 N. B. 3,000 N. C. 0.003 N D. 75,000 N.
As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is
A) static friction. B) kinetic friction. C) a combination of static and kinetic friction. D) neither static nor kinetic friction, but some other type of friction. E) It is impossible to tell what type of friction acts in this situation.
Do either Venus or Mars have composite volcanoes? Why or why not?
a. Venus has some composite volcanoes because of large currents of magma beneath the crust. Mars has only shield volcanoes because tectonics on Mars does not occur. b. Mars has some composite volcanoes because of its great shield volcano explosions. Venus has only shield volcanoes because of its low-density crust. c. Yes, volcanoes on Venus and Mars are higher, wider and have the composite structure because of repeated eruptions at the same place. d. Mars and Venus only have shield volcanoes. Geological processes are vertical on these planets, and plate tectonics and significant horizontal crust motion do not occur.
A eutectoid-composition
