In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What mass of copper is deposited in 10.0 minutes? Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C
A) 3.96 g B) 1.98 g C) 0.99 g D) 2.52 g E) 2.53 g
B
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Answer the following statement true (T) or false (F)
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the momentum of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 2.51 × 10-19 kg ? m/s B) 2.89 × 10-19 kg ? m/s C) 4.34 × 10-19 kg ? m/s D) 5.01 × 10-19 kg ? m/s E) 8.68 × 10-19 kg ? m/s
Suppose our sun had 4 times its present mass but the earth orbited it at the same distance as it presently does. What would be the length of the year on the earth under those conditions?
A) 1/4 as long as the present year B) 1/2 as long as the present year C) the same as the present year D) twice as long as the present year E) four times as long as the present year
For a damped driven harmonic oscillator, the frequency at which the amplitude is maximum is
A) greater than the natural frequency of oscillation. B) equal to the natural frequency of oscillation. C) at an infinite frequency. D) zero. E) less than the natural frequency of oscillation.