Answer:
T1 = 675 [N] ; T2 = 707.5 [N]
Explanation:
To solve this problem we must draw a free body diagram, where the bird is located, the posts and distances mentioned.
In the attached image we can see the free body diagram with different forces, angles and distances.
By conducting a distance analysis we can find the angles on both sides of the rope relative to the horizontal.
Then we perform a force analysis on the X-axis and the y-axis in order to find the two equations we need to find the stresses in the cables (T1 & T2)
First, let's calculate it's value: P(r) = (E² * r) / (r + r )² = E² / (4r) Now to check whether this is a maximum, we can compare it with other values of the function, in points between R = r and the other zeroes of P'(R), which here is R = -r. If P reaches a maximum in R=r, that would mean that (1) we can evaluate P in any point R>r and its value should be less than P(r), you can do this for, e.g. R=2r, which yields P(2r) = (2E²)/(9r), which is obviously smaller than P(r).
Also it means that (2) we can evaluate P in any point R so that -r < R < r, and this value should be smaller than P(r). For example, if we take R to be 0, P(R)=0, which is also smaller than P(r). Thus we have proven that P reaches a maximum in r, with corresponding value E² /(4r).
Solar Radiation is just light, or heat, from the sun (solar)
Answer:
D
Explanation:
Think about like charges meaning the charge is the same.
Which only D has two charges and are the same, positive will repel against positive charge so select D.
Answer:
B) The ratio of the speed of sound in rod A to the speed of sound in rod B is 1.
Explanation:
Applying Hooke's law,
F = -kx
Where,
F = force
k = spring stiffness
x = length
Element A
F/7k = x
Since, mass = F/A
Ma = 7Mb
Therefore,
7Mb/A*7kb = x
Mb/A*k = x
Element B
F/k = x
Since, mass = F/A
Mb = Mb
Therefore,
Mb/A*kb = x
Ratio of mass of element A and element B
Mb/A*kb : Mb/A*kb
1 : 1