1. A coffee maker is used every day 6 times for 10 minutes. The power of the cof

Question

1. A coffee maker is used every day 6 times for 10 minutes. The power of the coffee maker is specified with P = 1650 W. What are the costs that accumulate over one week (7 days) when the costs for electricity are 13 cents/ kWh?

2. A parallel-plate capacitor is constructed with circular plates of radius 6.6 cm. The plates are separated by 0.22 mm, and the space between the plates is filled with a dielectric with a dielectric constant . When the charge on the capacitor is 1.3 µC the potential difference between the plates is 725 V. Find the value of the dielectric constant .

3. To operate a given flash lamp requires a charge of 32 µC. What capacitance is needed to store this amount of energy in a capacitor with a potential difference between its plates of 9.0 V?

4. A point charge Q = 87.1 µC is held fixed at the origin. A second point charge, with mass m = 57.6 g and charge q = 2.87 µC, is placed at the location x = 0.323 m.

(a) Find the electric potential energy of this system of charges

(b) If the second charge is released from rest, what is its speed when it reaches the point x = 0.121 m?

Explanation / Answer

ans 1

total time used in a day=10*6=60 minute=1hour

in a week(7day)=1*7=7hour

P=1650W=1.650KW

so energy consuption in 7 day=1.650*7=11.55KWh

so Bill=11.50*13=381.15 cents =3.8115 dollar

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