2.
Write the SI unit of temperature and solid angle.
3.
State the law of triangle of forces,
4.
Define unlike parallel forces.
5.
State Hooke's law.
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steradian
The SI unit of solid angle is the steradian (sr). The solid angle of a complete sphere is 4π sr. The solid angle corresponding to the face of a cube measured at the centre is 2π/3 sr.
If two forces acting at a point are represented in magnitude and direction by the two adjacent sides of a triangle taken in order, then the closing side of the triangle taken in the reversed order represents the resultant of the forces in magnitude and direction
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