In a nuclear reactor, control rods are made of materials that: MCQ with Answer and Explanation

Explanation:
Phase 1: s1 = ½×4×25 = 50 m, v=20 m/s. Phase 2: s2 = 20×5 = 100 m. Total 150 m.

Explanation:
Michael Faraday.

Explanation:
Torque τ = r × F, so dimensions [L][MLT⁻²] = [ML²T⁻²]. Work W = F·d, dimensions [MLT⁻²][L] = [ML²T⁻²], identical. Momentum is [MLT⁻¹], force [MLT⁻²], power [ML²T⁻³]. Though torque and work have same dimensions, they are physically distinct: torque is vector (rotational effect), work is scalar (energy transfer). Memory tip: 'Torque and work share [ML²T⁻²]; but torque = rF sinθ, work = Fd cosθ'. This dimensional analysis question tests ability to compare quantities, frequently appearing in competitive exams. Always verify dimensions but remember physical context differs.