Tripling the aperture diameter of a camera lens will change the light intensity admitted to the film by what factor?
a. 0.11
b. 0.33
c. 3.0
d. 9.0
e. 12.0
d
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The circuit power factor of an RL circuit connected across an ac source is one. What would be a good description of the frequency of this source?
A) Low B) Very low C) High D) Very high
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
.
?
The magnitude, in meters, of the plane's displacement from the origin is
A. 9.14 × 103. B. 1.61 × 104. C. 1.84 × 104. D. 9.14 × 103t. E. 1.61 × 104t.
The gush of steam that issues from the escape valve of a pressure cooker is relatively cool
A) close to the opening. B) above the opening where vapor is visible. C) both of these D) none of the above
For an atom to be neutral, it must have the same number of:
a. electrons and neutrons b. electrons and protons c. neutrons and protons d. neutrons only e. electrons, neutrons, and protons