The expanding Universe theory:
contends that galaxies are moving away from Earth and from each other at fantastic speed.
is supported by the fact that all galaxies exhibit a red shift.
raises the question of when the expansion began.
resulted in the formulation of the big bang theory.
All of the above are true.
All of the above are true.
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The metric prefix that means one-hundredth (1/100) is
a. kilo-. b. centi-. c. mega-. d. milli-.
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N B) 400 N C) 800 N D) 2560 N E) 3920 N
Six kilograms on Earth has what mass on the moon?
A) 1. pound B) 6. kg C) 36. kg D) 1/6 kg E) 1. kg
A 5.0 ?C charge is placed at the 0 cm mark of a meter stick and a -4.0 ?C charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?
A) 1.4 m from the 0 cm mark B) 2.5 m from the 0 cm mark C) 2.9 m from the 0 cm mark D) 3.3 m from the 0 cm mark E) 4.7 m from the 0 cm mark