A 10th magnitude star is ________ than a 5th magnitude star.
A. 2 times fainter
B. 100 times fainter
C. 2 times brighter
D. 100 times brighter
Answer: B
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First Law of Thermodynamics: A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9.0 kJ of heat is applied to the system and it does 5.0 kJ of work, how much does the internal (thermal) energy of the fluid change?
A. 4.0 kJ B. 14 kJ C. -4.0 kJ D. 45 kJ
After 8.0 years have elapsed, 15/16 of a sample of a specific radionuclide has decayed. What is the half-life of the radionuclide?
Which of the following is the centerpiece in the unified model of active galactic nuclei (AGN) and quasars?
A) A blue giant B) An accretion disk C) A torus D) A black hole
A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?
A) Mrg B) 2 Mrg C) D) E) /