The efficiency of a solar cell is the ratio (numerator to denominator) of the ______
a. heat plus electricity produced to the solar input
b. light output to the electrical energy input
c. electricity output to the heat output
d. electricity output to the solar input
e. heat input to the electricity output
d
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LR Circuits: A 1.5-H inductor is connected in series with a 200-? resistor through an ideal 15-V dc power supply and an open switch. After closing the, what is the maximum energy that will be contained in the inductor?
A. 1.2 mJ B. 2.2 mJ C. 3.2 mJ D. 4.2 mJ E. 5.2 mJ
A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3 ) while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1040 kg/m3 B) 1030 kg/m3 C) 1050 kg/m3 D) 56.1 kg/m3 E) 960 kg/m3
How much heat must be removed from steam to change it to liquid?
A) 540 cal/g B) 600 cal/g C) 830 cal/g D) 1 kcal/g E) 1.8 kcal/g
Why are sedimentary rocks and the processes that produce them more accessible than igneous and metamorphic rocks?