A bus travels the first 20 km at 40 km/h and the next 20 km at 60 km/h. Average speed is MCQ with Answer and Explanation

Explanation:
Pole strength is a property of the magnet; when cut transversely, each piece still has both north and south poles with same pole strength as original. Magnetic moment becomes half because length halves. Each is a complete magnet.

Explanation:
Work W = F·d = Fd cosθ. cos0° = 1 gives maximum work. At 90°, cos90° = 0, work zero. For given magnitudes, maximum when force parallel to displacement. This is basic definition.

Explanation:
For small angular displacement, restoring force = -mg sinθ ≈ -mgθ, directed towards equilibrium. Tangential component of weight. Tension balances radial component. This causes SHM.