The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^?15 m) is
a. 4.3 × 10^2
b. 2.3 × 10^4
c. 1.4 × 10^2
d. 6.9 × 10^?3
e. 4.3 × 10^3
b
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In a circuit made up of inductor, resistor, ammeter, battery, and switch in series, at which of the following times after the switch is closed is the rate of current increase greatest?
a. reciprocal of one time constant c. ten time constants b. zero d. one time constant
Why might sodium carbonate (washing soda, Na2CO3) be added to hard water to aid in cleaning?
A) The hard ions in the water are more attracted to the carbonate ions -2 charge. B) The hard ions are dissolved by the added sodium ions. C) The soap gets softer due to the added ions. D) The ions solubilize the soap due to ion-ion intermolecular attraction, which improves the cleaning ability. E) none of the above
A 0.30-kg rock is swung in a circular path and in a vertical plane on a 0.25-m-length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N b. 16 N c. 18 N d. 83 N
How much heat (in kilocalories) is needed to convert 1.00 kg of ice at 0°C into steam at 100°C?
a. 23.9 b. 79.6 c. 564 d. 643 e. 720