Answer:
There are two laws stated below
Explanation:
There are two laws.
The first states that when an electric current moves through a coil an emf is induced in it.
Secondly it states the rate of change of flux is equal to the magnitude of the induced emf.
Michael Faraday is the proponent of these laws.
Answer:
1) Mass of the string = 0.0267kg
Explanation:
1) In the above question, we are given:
Length of guitar string = 60cm
Wave speed = 30.0m/s
Tension = 50N
9.81 N = 1 kg
50N = 50/9.81
= 5.10kg
We have the formula
v = √(F/μ)
Where F = the tension in the string in newtons,
v = the wave speed in m/s
μ = the mass per unit length of the string in kg/m
The formula for μ is derived as
v = √(F/μ)
Square both sides
v² = [√(F/μ)]²
v² = F/μ
μ = F/v²
From the question,
μ = 40/ 30.0²
μ = 0.044kg/m
To calculate the mass of the string we use the formula
μ = Mt / Lt = total mass/total length.
Total length = 60cm
In meters = 0.60m
0.044kg/m = Mt/ 0.60m
Mt = 0.0266666667kg
Mass of the string = Approximately 0.0267kg
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Answer:
A) 3.579J
B) - 110.36J
C) - 7.38N
Explanation:
A) Gravitational Potential Energy = mgh
Where m is mass, g is acceleration due to gravity and h=height.
Now in this question, height of well is taken to be in area of zero gravitational potential energy, thus
sign is positive.
Gravitational potential energy = mgh = 0.25 x 9.81 x 1.5 = 3.579J
b) In this question, the height is now below the area of zero gravitational potential energy and so h changes to -h.
Thus, sign is negative
Gravitational Potential Energy = mgh = 0.25 x 9.81 x (-4.5) = - 110.36J
c) Again, Gravitational Potential Energy = mgh
But here, since we are looking for change in gravitational potential energy, h = - h1 - h2
Thus,
Gravitational Potential Energy = mg(-h1-h2) = 0.25 x 9.81 x (-1.5-4.5) = - 7.38N
It's about 11.2 km/s ... what we would call 'escape velocity' if we run the same situation backwards.