The cosmic background radiation comes from a time after the origin of the universe
a. when protons and neutrons were first formed.
b. when the big bang first began to expand.
c. the inflationary period.
d. when gamma rays had enough energy to destroy nuclei.
e. when electrons began to recombine with nuclei to form atoms.
E
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We can determine the surface temperature of a star from
a. studying its continuous spectrum. b. studying its line absorption spectrum. c. measuring the star's luminosity. d. studying its continuous spectrum and measuring the star's luminosity. e. studying its continuous spectrum, studying its line absorption spectrum, and measuring the star's luminosity.
A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 turns through 2.4 revolutions during a 2.0-s time interval. What is the angular velocity at the end of this time interval?
a. 9.5 rad/s b. 9.7 rad/s c. 9.3 rad/s d. 9.1 rad/s e. 8.8 rad/s
The "normal" eye has a near point of 25 cm. If a given individual's near point is 73 cm, for what problem will the eye doctor prescribe correction?
a. myopia b. presbyopia c. hyperopia d. astigmatism e. color blindness
A 50.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a force of 250 N at an angle of 32.0° above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.350
What is the acceleration of the box? A) 0.638 m/s2 B) 1.74 m/s2 C) 3.16 m/s2 D) 6.31 m/s2 E) 8.53 m/s2