The resistance of a 50 watt bulb is ________ that of a 100 watt bulb, if both run on the same voltage.
A. double
B. one half
C. four times
D. one fourth
Answer: A
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A proton initially moves left to right long the x axis at a speed of 2.00 × 10^4 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.200 m before coming to rest. What acceleration magnitude does the proton experience?
a. 2.67 × 10^12 m/s2 c. 6.67 × 10^6 m/s2 b. 9.33 × 10^9 m/s2 d. 1.00 × 10^9 m/s2
A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?
Although it is greatly exaggerated as shown, what real effect does this diagram show?
A) The perihelion and aphelion of Mercury's orbit gradually precesses around the Sun. B) Time runs slow on Mercury. C) Mercury has a spiral shaped orbit around the Sun. D) Mercury will eventually fly off into space.
In the atoms of most materials the fields of individual electrons
A) cancel one another. B) partly align. C) completely align.