Engines, including car engines, are rated in horsepower. What is horsepower?
(a) The force needed to start the engine.
(b) The force needed to keep the engine running at a steady rate.
(c) The energy the engine needs to obtain from gasoline or some other source.
(d) The rate at which the engine can do work.
(e) The amount of work the engine can perform
Ans: (d) The rate at which the engine can do work.
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Thin Lenses: A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
The Huygens probe took numerous pictures as it descended to the surface of Saturn's moon Titan in 2005. What did the pictures show?
A) features or erosion, including what appeared to be dry river valleys and lakebeds B) primitive life forms C) a densely cratered surface D) lava flows of molten basalt
Avogadro's number has a numerical value of
a. 6.02 × 10^23. b. 1.00 × 10^23. c. 3.01 × 10^23. d. none of these.
If the current in the 4.0-? resistor is 1.4 A, what is the magnitude of the potential difference, VA ? VB?
a.
69 V
b.
55 V
c.
62 V
d.
48 V
e.
31 V