The energy of SHM when particle is at mean position is MCQ with Answer and Explanation

Explanation:
Latent heat of fusion of ice = 80 cal/g. So 1 g needs 80 cal. No temperature change.

Explanation:
Volume constant: A' = A/2 when L' = 2L. R' = ρ(2L)/(A/2) = 4ρL/A = 4R. Memory tip: 'Stretch wire: R ∝ L² when volume fixed'. Resistance proportionality frequently tested in competitive exams.

Explanation:
Water 4200 J/kg°C, used as coolant. Iron ~450, copper ~385, lead ~128.