In a two-slit experiment, light rays from the two slits that reach the third maximum on one side of the central maximum travel distances that differ by _____.
A. 3?
B. ?
C. ?/3
D. 2? /3
A. 3?
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The W+ and W- are "exchange particles" for
A) the gravitational force. B) the frictional force. C) the strong force. D) the electromagnetic force. E) the electroweak force.
An iron nail is attracted
A) more strongly to the north pole of a magnet. B) more strongly to the south pole of a magnet. C) equally to either pole of a magnet. D) none of the above
Which of the following best explains why the Sun's luminosity gradually rises over billions of years?
A) Fusion gradually decreases the number of independent particles in the core, allowing gravity to compress and heat the core, which in turn increases the fusion rate and the Sun's luminosity. B) Nuclear reactions in the Sun become more efficient with time, so that each fusion reaction releases more energy when the Sun is old than when it is young; this in turn raises the Sun's luminosity. C) The Sun's core gradually expands with time, and this expansion means there is more room for energy to be generated and hence increases the Sun's luminosity. D) The planets need more and more energy to maintain any life on them as time goes on, and therefore the Sun must bet hotter.
A 274-N uniform ladder, 11.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.400 . What minimum angle can the ladder make with the floor before it slips?
a. 84.3° b. 68.2° c. 21.8° d. 51.3° e. 11.3°