Explanation:
Total height = 30 × 0.2 m = 6 m. Work done = mgh = 50 × 10 × 6 = 3000 J. Power = Work/time = 3000/10 = 300 W. If steps height and number given, calculate total vertical displacement. Time taken for climbing is important. Power is rate of doing work.
Explanation:
Bimetallic strip consists of two metals with different coefficients of linear expansion. On heating, one expands more, causing bending. Used in thermostats, fire alarms. Expansion difference causes curvature.
Explanation:
Convection: movement of fluid due to density differences caused by temperature. Hot fluid rises, cold sinks, creating currents. Land/sea breeze, trade winds. Conduction in solids primarily.
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