A 1400kg car moving westward with a velocity of 15m/s collides with a utility pole and is brought to rest in 0.30sec. find the f
2 answers:
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For this case we have that by definition, physical power refers to the amount of work done for a unit of time.
So:
Where:
W: It's the work
t: It's time
The power units are in
So, according to the problem data we have:
Clearing the work of the formula:
Thus, the work is 1200 joules.
Answer:
Option C
Answer:
Voltage across 2 cm² wire = 29.5 V
Explanation:
We equation for resistance,
Where ρ is resistivity, L is length and A is area.
Here for the four wires ρ and L is same, only area is different.
So we have
Here total voltage is given as 120 V,
In series connection voltage divides in the ratio of resistances
That is
Voltage across 2 cm² wire
Voltage across 2 cm² wire = 29.5 V