J. J. Thomson
A) proposed the tiny central nucleus idea.
B) discovered radium and polonium.
C) observed back-scattering from nuclei.
D) proposed the plum-pudding model.
E) invented the particle detector tube.
D
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A few dozen supermassive black holes have measured masses, and in each case, the mass of the black hole is about _____ the mass of the surrounding central bulge
A) 0.005 percent B) 0.05 percent C) 0.5 percent D) 5 percent
Two tuning forks sounding together result in a beat frequency of 4.00 Hz. If the frequency of one of the forks is 258 Hz, what is the frequency of the other?
a. 266 Hz or 250 Hz b. 129 Hz c. 254 Hz or 262 Hz d. 64.5 Hz e. 131 Hz
A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is
A) 3000 kg. B) 2880 kg. C) 144 kg. D) 0.200 kg. E) 5.21 kg.
A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2 . What is the moment of inertia (of the wheel) about the
given axle? a. 0.023 kg/m2 b. 0.013 kg/m2 c. 0.020 kg/m2 d. 0.016 kg/m2 e. 0.035 kg/m2