A driver in a 1000 kg car traveling at 20 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m
B) 21 m
C) 33 m
D) 24 m
A
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A star on the main sequence has 7 solar masses. The star will evolve into a ____________ and its core will be supported by ______________.
a. white dwarf, electron degeneracy pressure b. neutron star, neutron degeneracy pressure c. black hole, no pressure (i.e., it will not be supported) d. white dwarf, neutron star, or black hole; electron degeneracy, neutron degeneracy, and no pressure, respectively.
A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the direction of the velocity of the wave?
A. the + z direction B. the + y direction C. the + x direction D. the - z direction E. the - y direction F. the - x direction
How many moons does Mars have?
A) none B) one C) two D) three E) four
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.