A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. The current has the same value for each section of the wire, so charge does not accumulate at any one point. How does the resistance per unit length vary along the wire as the area becomes smaller?
1.It increases.
2.It decreases.
3.It remains constant.
1
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A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) None of the above things happen.
A spectrum that displays no energy except at very specific wavelengths where intense radiation is observed is a(n) ____ spectrum
a. absorption b. emission c. continuous d. Doppler e. ionization
To predict the approximate energy release of either a fission or a fusion reaction, explain how a physicist uses a table of nuclear masses and the equation E = mImage
A) find the change in mass and divided by the speed of light squared B) find the change in mass and multiply by the speed of light squared C) find the change in mass, square it, and multiply by the speed of light D) take the square root of the change in mass and multiply by the speed of light
Which of the following would be "exponential" growth of your bank savings account?
A) Growth by 7% every year B) Growth by $1000 every year C) Both of the above. D) Neither of the above