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Question

The pair of quantities that do not have the same dimensions is
  1. Gravitational force, Coulomb force
  2. Kinetic energy of a freely falling body, potential energy of compressed spring
  3. Latent heat, specific heat
  4. Coefficient of friction, number of molecules in a container.

A
Latent heat, specific heat
B
Gravitational force, Coulomb force
C
Kinetic energy of a freely falling body, potential energy of compressed spring
D
Coefficient of friction, number of molecules in a container.
Solution
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  • Specific heat: = energy required to change a unit mass of a material by 1°C. Units: energy per unit mass per degree.
  • Latent heat = energy required to change the state (gas, liquid, solid) of a unit mass of material. Units: energy per unit mass.

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