A beam of laser light is
a. neither monochromatic nor coherent.
b. monochromatic but not coherent.
c. coherent but not monochromatic.
d. both monochromatic and coherent.
d
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Graphical Analysis: If the velocity versus time graph of an object is a horizontal line, the object is
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A battery supplies 6.0 mA to a 12-? resistor for 1.5 h. How much electric energy does this resistor dissipate in this time?
What will be an ideal response?
A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?
A) 9.8 A B) 2.5 A C) 1.2 A D) 4.9 A
How large a force is required to accelerate a 1600 kg car from rest to a speed of 25 m/s in a distance of 200 m?
A) 1600 N B) 0 N C) 200 N D) 400 N E) 2500 N