Based on the nature of constructive interference,
none of the wave intersections will produce constructive interference.
<h3>What is constructive interference?</h3>
Constructive interference is interference that occurs when two waves of the same frequency amplitude and wavelength travelling in the same direction are superposed with the resultant effect of reinforcement of both waves to produce a larger wave.
Constructive interference occurs when the path difference between two identical waves at a point is:
where n = 0, 1, 2, ...
For the various intersections:
- 1.77 cm crest intersecting with a 0.65 cm crest; n = 1.77/0.65 = 2.7
- A 1.2 mm crest intersecting with a 3.9 mm trough is destructive.
- A 4.55 N trough intersecting with a 1.59 N trough; n = 4.55/1.59 = 2.8
- A 0.44 inch trough intersecting with a 0.72 inch crest is destructive.
- A 7.42 mm trough intersecting with a 1.93 mm trough; n = 7.42/1.93 = 3.8
Therefore, none of the wave intersections will produce constructive interference
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<u>Answer:</u>
148.4 J
<u>Explanation:</u>
We are given that the efficiency of a pulley system is 74.2% and we are to calculate the useful work done if we perform 200 J of work
We know that efficiency is basically the measure of how efficient a process is.
The formula of efficiency is given by:
<em>Efficiency = useful energy output / total energy input</em>
So substituting the given values in the above formula:
0.742 = Useful energy / 200 J
Useful energy = 148.4 J
Boss tweed encourage his associates to work like a well oiled machine
thus providing his workers with benefits that encourages them to work like a
well oiled machine. A well oiled machine means that it does not stop, its work
is continuous and efficient.
Question: 5
The length of the pendulum is 7.6 m.
<h3>What is the expression of length of a pendulum in term of time period?</h3>
- Time period of the pendulum (T) = 2π×√(L/g)
- L= length of pendulum, g = acceleration due to gravity on earth
So, L = T²g/4π²
<h3>What is the length of the pendulum, if the time period is 3.20 s and acceleration due to gravity becomes 3×g?</h3>
- T= 3.20 s
- L = (3.2²×3×9.8)/4π²
= 7.6 m
Thus, we can conclude that the length of the pendulum is 7.6 m i.e option C is correct.
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Question: 6
The object takes 2.55 seconds to reach the ground.
<h3>What is the expression of time taken to reach the earth surface by an object?</h3>
- From the conversation of energy, (1/2)mv²=mgh
- So, v=√(2gh)
- From Newtown's equation of motion, v=u+at
- Here, a= acceleration due to gravity which is g
- So, √(2gh)=gt
t= √(2h/g)
<h3>What is the time taken by an object dropped from 31 m to reach the ground?</h3>
t= √(2×31/9.8)
= 2.55s
Thus, we can conclude that the option A is correct.
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Answer:
V * ρB = WB volume of ball * density of ball = weight of ball
V * ρW = Ww volume of ball * density of water = buoyant force
ρB / ρW = WB / Ww = 80 / 20 = 4 water provides 20 N of buoyant force
ρB = 4 ρW = 4 gm/cm^3
ρW = 1000 kg / m^3 = 1 gm / cm^3
(1 gm/cm^3) = .001 kg / .000001 m^3 = 1000 kg/^3
ρW = 1 gm / cm^3
multiply by 9.8 or 980 to get weight densities
In this case
4 * 1000 kg/m^3 * 9.8 m/s^2 = 39200 N /m^3 weight density of ball