A 1.53-kg bucket hangs on a rope wrapped around a pulley of mass 7.07 kg and radius 66 cm. This pulley is frictionless in its axle, and has the shape of a solid uniform disk
After the bucket has been released, (a) what is the angular acceleration of the pulley, and (b) what is the acceleration of the bucket?
(a) 4.5 rad/s2 (b) 3.0 m/s2
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If the inductance and the capacitance both double in an LRC series circuit, the resonant frequency of that circuit will
A) decrease to one-half its original value. B) decrease to one-fourth its original value. C) decrease to one-eighth its original value. D) increase to twice its original value. E) increase to four times its original value.
A hydrogen atom is in its n = 2 excited state when its electron absorbs a photon of energy . What is the energy of the resulting free electron? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.1 eV B) 6.6 eV C) 6.9 eV D) 7.7 eV
The half-life of radium is
A) the time after which an individual radium atom splits in half. B) the time during which half of a large number of radium atoms will decay. C) half the lifetime of the individual radium atom. D) the life-time of the individual radium atom. E) half of the total time during which a quantity of radium will radioactively decay.
One hundred meters of a certain type of wire has a resistance of 7.2 
What is the resistance of 2.5 m of this wire?
A. 18
B. 1.8
C. 0.18
D. 3.0
E. 0.30