Gamma ray bursts _____
a. last minutes to hours
b. are detected primarily in the disk of the galaxy
c. occur without warning
d. are not associated with any observable event
e. are detected only a few times per year
c
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One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to
A) an odd number of half-wavelengths. B) an even number of half-wavelengths. C) zero. D) a whole number of wavelengths. E) a whole number of half-wavelengths.
Angular and Linear Quantities: A child is riding a merry-go-round that is turning at 7.18 rpm. If the child is standing 4.65 m from the center of the merry-go-round, how fast is the child moving?
A. 5.64 m/s B. 3.50 m/s C. 0.556 m/s D. 1.75 m/s E. 1.80 m/s
?Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30°angle. A light ray that approaches mirror 1 is parallel to mirror 2. The angle of reflection of that ray from mirror 1 is
A. ?0°. B. ?30°. C. ?60°. D. ?90°. E. ?120°.
A glass tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick
At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3°C per minute. What is the temperature of the outside surface of the bottom of the tea kettle? Neglect the heat capacity of the kettle, and assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of glass is 0.840 W/m ? K and the specific heat of water is 4186 J/kg ? K. A) 39°C B) 92°C C) 120°C D) 86°C E) 77°C