Are solar cell efficiencies of over 30% realizable under realistic use conditions (include cost in these conditions)? Explain
What will be an ideal response?
This is difficult to give a definitive answer to. In the past, the efficiencies at the
frontiers of research were higher and very expensive. As the frontier advanced, these
efficiencies were available for much more modest costs. At present, 30% efficiency solar
cells are quite expensive. If the trends of the efficiencies and costs up to the present
continues to hold, these solar cells will be much cheaper in the coming decades.
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A disk has a moment of inertia of 3.0 × 10^-4 kg•m2 and rotates with an angular speed of 3.5 rad/sec. What net torque must be applied to bring it to rest within 3.7 s?
a. 4.6 × 10^-4 N•m c. 3.5 × 10^-4 N•m b. 7.5 × 10^-4 N•m d. 2.8 × 10^-4 N•m
The fundamental particles that are the building blocks of hadrons are __________
Fill in the blank(s) with correct word
If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas, that its:
a. temperature increases. c. pressure increases. b. volume increases. d. internal energy decreases.
Uniform Circular Motion: A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s.(a) What are the magnitude and direction of the acceleration of the ball?(b) Find the tension in the string.
What will be an ideal response?