A 100 W lightbulb has an energy efficiency of 5%. It is turned on for one minute. Its total energy output during this minute is
A) 6000 J.
B) 300 J.
C) 5700 J.
D) impossible to determine because we don't know the voltage.
E) impossible to determine because we don't know the power.
A
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A thin beam of laser light of wavelength 514 nm passes through a diffraction grating having 3952 lines/cm. The resulting pattern is viewed on a distant curved screen that can show all bright fringes up to and including ±90.0° from the central spot
If the experiment were performed with all of the apparatus under water (which has an index of refraction of 1.33), what would be the TOTAL number of bright spots that would show up on the screen? A) 6 B) 7 C) 12 D) 13 E) 14
Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
A volume of air that is compressed with no heat entering or leaving becomes
A) cooler. B) remain unchanged. C) warmer. D) none of the above