Which of the following statements (with respect to compass traversing) are correct?
A. True meridian at a station is constant.
B. True meridian passing through different points on the earth surface converges towards the pole.
C. The angle between the true meridian and the line is known as declination.
D. The angle between the magnetic meridian and the line is known as azimuth.
Choose the most appropriate answer from the options given below:
Step 1: Check statement A.
The true meridian at a station is fixed and does not change. Hence, (A) is correct.
Step 2: Check statement B.
True meridians from different locations converge towards the geographic North Pole. Hence, (B) is correct.
Step 3: Check statement C.
The angle between the true meridian and magnetic meridian is known as declination, not between true meridian and the line. So, (C) is incorrect.
Step 4: Check statement D.
The angle between a line and true meridian is called azimuth, not with magnetic meridian. So, (D) is incorrect.
Step 5: Conclusion.
Correct statements are A and B only.
A weight of $500\,$N is held on a smooth plane inclined at $30^\circ$ to the horizontal by a force $P$ acting at $30^\circ$ to the inclined plane as shown. Then the value of force $P$ is:
A steel wire of $20$ mm diameter is bent into a circular shape of $10$ m radius. If modulus of elasticity of wire is $2\times10^{5}\ \text{N/mm}^2$, then the maximum bending stress induced in wire is: