Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?
a. polarization
b. particle nature
c. wave nature
d. electromagnetic character
c
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An ore car of mass 4 000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction
RLC Circuits: A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-? resistor. What is the rms value of the current in this circuit?
A. 0.80 A B. 1.2 A C. 1.4 A D. 1.6 A E. 1.8 A
A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the value of the resistor?
A) 100 ? B) 184 ? C) 552 ? D) 579 ? E) 200 ?
A nearsighted person has her distant vision corrected using a -2.0 D lens. Her uncorrected near point is 15 cm. What is her near point using this lens if the lens is 2.0 cm from the eye?
A) 17 cm B) 20 cm C) 13 cm D) 18 cm E) 15 cm