A resistor is connected to normal 60. Hz, 120. volt AC. How many times a second does the instantaneous dissipated POWER reach a maximum?
A) 240
B) 0
C) 60
D) 30
E) 120
E
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Defining momentum as ?mv Einstein was able to show
A. that different observers may not agree on the values of velocities or momenta, but they still find that momentum is conserved. B. that different observers could then obtain the same values of velocities and momenta, and thus show that momentum is conserved. C. that momentum is not conserved at speeds near light speed.
The total energy of a particle
a. is not related to its relativistic momentum. b. increases with increasing relativistic momentum. c. decreases with increasing relativistic momentum. d. is a constant.
A proton with mass 1.67 × 10^?27 kg moves in an accelerator with a speed of 0.780c. What is its total energy? (c = 3.00 × 10^8 m/s)
a. 1.50E–10 J b. 3.90E–10 J c. 2.40E–10 J d. 7.51E–19 J e. 1.28E–18 J
Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where:
a. the crest from one wave overlaps with the crest from the other. b. the crest from one wave overlaps with the trough from the other. c. the troughs from both waves overlap. d. darkness cannot occur as the two waves are coherent.