_____ is dark matter which is made of slow moving particles
A) Cold dark matter
B) Rayon
C) Hot dark matter
D) Tachyon
A
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If grand unified theories are correct, what caused inflation at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time. B) Large amounts of matter and antimatter annihilated at this time. C) There wasn't enough matter present to slow down the expansion at that time. D) The universe was too small and needed to grow quickly. E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
A) 0.161 B) 0.188 C) 0.0441 D) 0.0851 E) 0.103
Kirchhoff's rules are the junction rule and the loop rule. Which of the following statements is true?
a. Both rules are based on the conservation of charge. b. Both rules are based on the conservation of energy. c. The junction rule is based on the conservation of charge, and the loop rule is based on the conservation of energy. d. The junction rule is based on the conservation of energy, and the loop rule is based on the conservation of charge.
The wavelengths associated with thermal radiation at everyday temperatures are in the ________ spectral region.
A. infrared B. ultraviolet C. shorter visual D. longer visual E. x-ray