Answer:
θ=0.0288 radian
Explanation:
resolution limit is the minimum angular separation of two sources that can be viewed distinctly by telescope
θ=0.0288 radian
A2A.
Let the magnitude of the two forces be x and y.
Let resultant at right angle be p(= √15N) and at 60 degrees be q(= √18N.
Now, p = √(x2 + y2) = √15,
q = √(x2 + y2 +2xycos60) = √18.
So x2 + y2 = 15,
x2 + y2 + xy = 18,
therefore xy = 3 or y = 3/x.
Now, x2 + (3/x)2 = 15,
x4 + 9 = 15x2,
x4 - 15x2 + 9 = 0.
Now find the roots of this quadratic equation, the two values of x will correspond to the magnitudes of the two vectors.
Explanation:
Polymer degradation is a change in the properties of the polymer – such as tensile strength, color, shape, molecular weight – or of a polymer-based product under the influence of one or more environmental factors, such as heat, light, chemicals, or any other applied force.
- <em>Photoinduced degradation:</em> Electromagnetic waves with the energy of visible light or higher, such as ultraviolet light, X-rays and gamma rays are usually involved in such reactions.
- <em>Thermal degradation:</em> Chain-growth polymers can be degraded by thermolysis at high temperatures to give monomers, oils, gases and water. This kind of degradation can happen by pyrolysis, hydrogenation or gasification:
- <em>Chemical degradation:</em> it can happen through many mechanism such as oxidation, ozone cracking, galvanic actior or Chlorine-induced cracking
- <em>Biological degradation:</em> by microorganisms to give lower molecular weight molecules
In the case of ceramics, environmental factors are the major cause. There are several ways in which ceramics break down physically and chemically
- <em>Physical degrdation:</em> from mishandling, impacts and abrasion, frost and mold growth
- <em>Chemical degradation:</em> because of water and soluble salts
I hope you find this information useful and interesting! Good luck!
Answer:
causes: unemployment, poverty,Lack of education,urbanization e.t.c
solutions:making people educated, giving people jobs