Two mechanical waves meet and coincide. One wave has a positive displacement from the equilibrium position, and the other wave has a negative displacement. What kind of interference occurs?
a. constructive
b. destructive
c. complete constructive
d. none
Ans: b. destructive
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The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on December 21st for an observer at latitude 48° N?
a. 1
b. 2
c. 3
d.The sun will set in the east.
e.The sun will not set on December 21st at this latitude.
shown. Inside the glass, the laser beam will take path nair = 1.000, nglass = 1.50
A. 1
B. 2
C. 3
A 22-A current flows into a parallel combination of 4.0 ?, 6.0 ?, and 12 ? resistors
(a) What current flows through the 12-? resistor? (b) What current flows through the 6.0-? resistor? (c) What current flows through the 4.0-? resistor?
You travel 2640 feet in thirty seconds while in a 65 mi/hr zone. (There are 5280 ft in one mi.) Your average speed is
A. less than the speed limit. B. larger than the speed limit. C. exactly the speed limit.