Có thể một lực hướng tâm tạo ra công trên một vật hay không? Hãy giải thích
1 answer:
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Answer:
Frequency change by a factor of 2.
(b) is correct option.
Explanation:
Given that,
Mass = 16 kg
Replaced mass = 4 kg
We need to calculate the frequency
Using formula of frequency
Put the value into the formula
....(I)
...(II)
Hence, Frequency change by a factor of 2.
Let's consider two resistors only for simplicity. When the resistors are connected in parallel, the potential difference on each resistor is the same, and it is equal to the voltage of the battery, V:
(1)
Instead, the current splits in the two resistors:
(2)
where I is the current in the circuit, I1 and I2 are the currents in the two resistors.
By using Ohm's law, we can rewrite (2) as
(3)
where
is the equivalent resistance of the circuit. But we also said that
So we can rewrite (3) as
which becomes
So, the equivalent resistance of the parallel of n resistors is given by
Instead, the current splits in the two resistors:
where I is the current in the circuit, I1 and I2 are the currents in the two resistors.
By using Ohm's law, we can rewrite (2) as
where
So we can rewrite (3) as
which becomes
So, the equivalent resistance of the parallel of n resistors is given by