What impulse results if the force acting on an object is described by the force-time graph shown?
1 answer:
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Answer:
a. I = 30 A
b. E = 1080000 J = 1080 KJ
c. ΔT = 12.86°C
d. Cost = $ 4.32
Explanation:
a.
The current in the coil is given by Ohm's Law:
where,
I = current = ?
V = Voltage = 120 V
R = Resistance = 4 Ω
Therefore,
<u>I = 30 A</u>
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b.
The energy can be calculated as:
<u>E = 1080000 J = 1080 KJ</u>
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c.
For the increase in the temperature of water:
where,
m = mass of water = 20 kg
C = specific heat of water = 4.2 KJ/kg.°C
Therefore,
<u>ΔT = 12.86°C</u>
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d.
First, we will calculate the total energy consumed:
Now, for the cost:
<u>Cost = $ 4.32</u>