Thermal energy can be described as
A) microscopic kinetic energy. B) macroscopic kinetic energy.
C) Both of the above. D) None of the above.
C
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Sirius A and Sirius B constitute a binary star pair in which the stars orbit their common center of mass with a period of 49.9 years. The stars are 2.40 × 1012 m apart
Assume that the two stars have equal masses and that they move in a circle about their common center of mass. What is the mass of each star? G = 6.67 x 10-11 N•m2/kg2. A) 5.41 × 1030 kg B) 2.70 × 1030 kg C) 7.55 × 1030 kg D) 3.30 × 1030 kg E) 1.65 × 1030 kg
Time Dilation: An unstable particle is moving at a speed of 1.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 6.8 × 10-6 s. What is the lifetime of the particle as measured in the rest frame of the particle? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
A sphere hanging freely from a cord is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.
Define an exothermic reaction. Give an example