A uniformly charged rod (length = 2.0 m, charge per unit length = 5.0 nC/m) is bent to form one quadrant of a circle. What is the magnitude of the electric field at the center of the circle?
a. 62 N/C
b. 56 N/C
c. 50 N/C
d. 44 N/C
e. 25 N/C
c
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A particle is moving with a constant acceleration of 4.0 m/s2 . Its speed at t = 1.0 s is 4.0 m/s and at t = 3.0 s it is 12.0 m/s. What is the area under the position-time graph for the interval from t = 1.0 s to t = 3.0 s?
a. 8.0 m/s b. 8.0 m c. 12 m d. 16 m e. 16 m/s2
There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of
A) a large auditorium. B) a large city. C) the United States. D) the whole world. E) none of the above
The chromosphere of the Sun
a. is hotter than the photosphere. b. appears yellow-white in color during total solar eclipse. c. is the visible surface of the Sun. d. produces an absorption spectrum. e. all of the others.
Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components
Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components? A) A chemical property involves a chemical change so that you no longer have what you had. B) Chemical properties are not as apparent as are physical properties. C) The chemical properties of the components of a mixture are too similar to each other. D) The chemical properties of the components of a mixture are too different from each other.