A boy slides a book across the floor, using a force of 5 N over a distance of 2
1 answer:
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Answer:
A. The wires will be arranged in order of increasing resistance.
Explanation:
The resistance of a wire is given by
where
is the resistivity of the material
L is the length of the wire
A is the cross-sectional area of the wire
In this problem we have several wires made of the same material (so, same ) and same length (same L): so, the only quantity that changes is their thickness, so their value of A.
We see from the formula that the resistance R is inversely proportional to the cross-sectional area A: therefore, the smaller the value of A, the larger the value of R. This means that if we arrange the wires in order of decreasing thickness, we are arranging the wires in order of increasing resistance.
Answer:
4.836 dollars
Explanation:
When the power in watts is multiplied by the amount of time the power is used we get the power in the following form.
The power in kWh is
Cost of kWh = 6.5 cents (assumed)
Cost in a month is given by
The cost per month is 4.836 dollars per 31 days