An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis
B. they converge toward each other
C. they emerge parallel to each other but not the principle axis
D. they diverge from each other
D. they diverge from each other
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An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
A heat engine absorbs energy of magnitude |QH| as heat from a high temperature reservoir, does work of magnitude |W|, and transfers energy of magnitude |QL| as heat to a low temperature reservoir. Its efficiency is:
A. |QH|/|W| B. |QL|/|W| C. |QH|/|QL| D. |W|/|QH| E. |W|/|QL|
Which of the following is needed in order to produce a uranium fission bomb?
A) an isotope separation, or enrichment, facility B) plutonium C) deuterium and tritium D) All of the above. E) None of the above.
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The power consumed by the light bulb is 20 watts
a. True b. False Indicate whether the statement is true or false