Elementary Particles: Which of the following statements about hadrons are correct? (There may be more than one correct choice.)
A. Hadrons are composed of leptons.
B. All hadrons are composed of quarks.
C. All hadrons interact by the strong nuclear force.
D. Electrons, protons, and neutrons are commonly-occurring hadrons.
E. Protons and neutrons are hadrons, but the electron is not.
Answer: E
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Which of the following statements about brown dwarfs is not true?
A) Brown dwarfs eventually collapse to become white dwarfs. B) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature. C) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores. D) All brown dwarfs have masses less than about 8% that of our Sun.
A weight lifter can bench press How many milligrams is this?
A) 1.71 × 108 mg B) 1.71 × 109 mg C) 1.71 × 107 mg D) 1.71 × 106 mg
A 50-kg air conditioner is placed on top of a concrete pad that is 20 cm thick and has a cross-sectional area of 3.0 m2. What is the change in thickness of the pad caused by the air conditioner? Young's modulus for concrete is 2.3 × 1010 N/m2
A) 1.4 × 10-9 m B) 2.8 × 10-9 m C) 1.4 × 10-8 m D) 1.4 × 10-7 m E) 2.8 × 10-8 m
A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz,
what is the phase angle between the voltage and the current? A) 23 rad B) -1.6 rad C) 1.5 rad D) 3.1 rad