Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is
A) 4 to 1.
B) 2 to 1.
C) the same.
D) 42to 1.
E) 1 to 2.
B
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A unified model of active galaxy cores can explain different types of Seyfert galaxies, quasars and other active galaxy types by differences in the ____
a. mass of the supermassive black hole b. size and thickness of the accretion disk c. magnetic flux strength in the jets d. amount of dust in the accretion disk e. tilt of the accretion disk to the line of sight
What distinguishes quarks from leptons?
A) Quarks interact with one another via the strong force, while leptons do not. B) Quarks are usually found in isolation, while leptons combine to make larger particles. C) Quarks have integer spins, but leptons have half-integer spins. D) Quarks have no charge, while leptons do. E) "Quark" and "lepton" are names for the same type of particle.
The exclusion principle applies to what kind of particles?
A) all fermions, but not bosons B) all bosons, but not fermions C) only leptons, but not other fermions D) both fermions and bosons E) only exchange bosons
Buoyancy: A barge with vertical sides is 10 m wide and 60 m long and is floating in fresh water of density 1000 kg/m3. How much deeper into the water does the barge sink when 3.0 × 105 kg of coal are loaded on the barge?
A. 25 cm B. 50 cm C. 75 cm D. 1.0 m E. 1.5 m