Multiple Response: Newton's second law (select 3)
2 answers:
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(a) 423 J
The power of the battery is the ratio between the total energy stored (E) and the time elapsed (t):
However, the power is also the product of the voltage (V) and the current (I):
Linking the two equations together,
Since we know:
V = 9.0 V
We can calculate the total energy:
(b) dollars
The battery has a total energy of E = 423 J. (2)
1 Watt (W) is equal to 1 Joule (J) per second (s):
so 1 kW corresponds to 1000 J/s:
Multiplying both side by 1 hour (1 h):
and , so
So we find the conversion between kWh and Joules. So now we can convert the energy from Joules (2) into kWh:
And since the cost is $0.0660 per kilowatt-hour, the total cost will be
dollars
An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2. what is the capacitance of this capacitor with air between these plates<u> 8.9 pF.</u>
An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates.
The capacitance of a parallel plate capacitor depends on area of each plate, dielectric medium between the plates and distance between the plates.
The amount of energy stored in a plate capacitor is given by
⇒ U = ,
where, Q is the stored charge and C is the capacitance,
To learn more about parallel plate capacitor, here
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