A LASIK vision-correction system uses a laser that emits 10-ns-long pulses of light, each with 3.0 mJ of energy. The laser beam
1 answer:
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The force on the fry is
Explanation:
We can find the force acting on the fry by using Newton's second law:
where
F is the net force on the fry
m is its mass
a is its acceleration
For the fry in this problem,
Therefore, the force exerted on the fry is
Learn more about Newton's second law here:
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Answer:
v = 1.6 m/s
Explanation:
Given that,
Distance, d = 72 m
Time taken, t = 45 s
We need to find their average velocity. Average velocity of an object is given by total distance divided by total time taken.
So, their average velocity is 1.6 m/s.
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>