
(a)
The number of hours in one year the light is on.
(a)

Answer to Problem 3SP
The number of hours in one year the light is on is
Explanation of Solution
Given Info: A bulb is switched on for
Write the expression for the total time the light is on.
Here,
Substitute 5 hr for the hours the light is on and 350 for the number of days to find the total time the light is on.
Conclusion:
Therefore, the number of hours in one year the light is onis
(b)
The energy in kilowatt-hour.
(b)

Answer to Problem 3SP
The energy in kilowatt-hour is
Explanation of Solution
Given Info: A bulb is switched on for
Write the expression for the energy.
Here,
Substitute
Conclusion:
Therefore, the energy in kilowatt-hour is
(c)
The energy in kilowatt-hour for a
(c)

Answer to Problem 3SP
The energy in kilowatt-hour is
Explanation of Solution
Given Info: A bulb is switched on for
Write the expression for the energy.
Substitute
Conclusion:
Therefore, the energy in kilowatt-hour is
(d)
The cost of using
(d)

Answer to Problem 3SP
The cost of using
Explanation of Solution
Given Info: The cost of electricity is
Write the expression for the total cost.
Substitute
Conclusion:
Therefore, the cost of using
(e)
The cost of using
(e)

Answer to Problem 3SP
The cost of using
Explanation of Solution
Given Info: The cost of electricity is
Write the expression for the total cost.
Substitute
Conclusion:
Therefore, the cost of using
(f)
The savings made by using
(f)

Answer to Problem 3SP
The savings made by using
Explanation of Solution
Given Info: The cost of electricity is
Write the expression for the savings made.
Substitute
Conclusion:
Therefore, the cost of using
(e)
The savings made by using twenty
(e)

Answer to Problem 3SP
The savings made by using twenty
Explanation of Solution
Given Info: The cost of electricity is
Write the expression for the total savings made.
Substitute
Conclusion:
Therefore, the savings made by using twenty
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Chapter 1 Solutions
The Physics of Everyday Phenomena
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- The drawing shows two long, straight wires that are suspended from the ceiling. The mass per unit length of each wire is 0.050 kg/m. Each of the four strings suspending the wires has a length of 1.2 m. When the wires carry identical currents in opposite directions, the angle between the strings holding the two wires is 20°. (a) Draw the free-body diagram showing the forces that act on the right wire with respect to the x axis. Account for each of the strings separately. (b) What is the current in each wire? 1.2 m 20° I -20° 1.2 marrow_forwardplease solve thisarrow_forwardplease solve everything in detailarrow_forward
- 6). What is the magnitude of the potential difference across the 20-02 resistor? 10 Ω 11 V - -Imm 20 Ω 10 Ω 5.00 10 Ω a. 3.2 V b. 7.8 V C. 11 V d. 5.0 V e. 8.6 Varrow_forward2). How much energy is stored in the 50-μF capacitor when Va - V₁ = 22V? 25 µF b 25 µF 50 µFarrow_forward9). A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. What is the charge on the capacitor 2.0 s after the switch is closed? R 50 V a. 0.43 C b. 0 66 C c. 0.86 C d. 0.99 C Carrow_forward
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