When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of __________
Fill in the blank(s) with correct word
interference
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When a fan is turned off, its angular speed decreases from 10 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the average angular acceleration of the fan?
A) 0.86 rad/s2 B) 0.74 rad/s2 C) 0.37 rad/s2 D) 11 rad/s2 E) 1.2 rad/s2
The density of the universe is large enough that gravity alone will eventually halt its expansion
Indicate whether the statement is true or false
The fission reaction involves
A) the splitting of a large molecule into smaller molecules. B) the splitting of a heavy nucleus. C) the combining of two low-mass nuclei. D) the combining of two lighter molecules into a heavier molecule. E) the splitting of a light nucleus.
A block is projected with speed v across a horizontal surface and slides to a stop due to friction. The same block is then projected with the same speed v up an incline where is slides to a stop due to friction. In which case did the total mechanical energy of the block decrease the least?
a. This problem cannot be solved since it was not indicated whether the horizontal surface and the incline both had the same coefficient of kinetic friction. b. The case on the horizontal surface had the least decrease in total mechanical energy. c. The case on the inclined surface had the least decrease in total mechanical energy. d. In both cases the decrease in mechanical energy was the same.