A solar panel measures 80 cm × 50 cm. In direct sunlight, the panel delivers 4.8 A at 15 V. If the intensity of sunlight is 1000 W/m2, what is the efficiency of the solar panel in converting solar energy into electrical energy?
a. 12%
c. 18%
b. 24%
d. 6.0%
C
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If the electrical potential in a region is constant, the electric field must be zero everywhere in that region
A) True B) False
When the principal quantum number of the
hydrogen electron is infinite, a) the electron has an orbit of 0.053 nm radius. b) the electron has a binding energy of +13.60 eV. c) the electron has a binding energy of -13.60 eV. d) the electron is no longer bound to the hydrogen nucleus at all.
A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
A. the first car will stop moving. B. the first car will move in the direction of the force. C. the first car's velocity will increase in magnitude but not change direction. D. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. E. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
What physical property of a star does the spectral type measure?
A) density B) luminosity C) temperature D) mass E) composition