A resistor, R, is made out of a particular material with resistivity P. The cylindrically shaped resistor has length I and radius r. To get four times as much resistance in your resistor you could
1.make the radius four times as big.
2.make the radius half as big.
3.make the radius one quarter the size.
4.make the radius twice as big.
2
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What term describes a consistent natural phenomenon for which there is an incomplete scientific explanation?
a. scientific theory b. law of nature c. hypothesis d. scientific law e. scientific method
Find the momentum and speed of a proton whose kinetic energy equals its rest energy. (The mass of a proton is 938.3 MeV/c2)
Ultraviolet light is shone on a piece of metal that has a known work function, and electrons are observed being produced through the interaction of the light with the metal. The lamp that produces the light is now replaced with a lamp of the same intensity, but which produces photons having a shorter wavelength. Which of the below differences is observed?
A. Fewer electrons per unit time are produced. B. More electrons per unit time are produced. C. Nothing changes at all. D. Electrons with a higher maximum energy are observed. E. Electrons with lower maximum energy are observed.
The majority of the mass of the Milky Way lies farther out than the Sun's orbit
Indicate whether the statement is true or false