Ideal gas: no intermolecular forces ⇒ internal energy = kinetic energy ∝ T. U = f/2 nRT. Memory tip: 'Ideal gas: U = U(T) only; real gases have V dependence'. Thermodynamics concept frequently tested in competitive exams.
Explanation:
Work done (W) is calculated as the dot product of force and displacement: W = F × d × cos(θ). Since the displacement is in the direction of the force, the angle θ is 0°, and cos(0°) = 1. W = 10 N × 2 m × 1 = 20 Joules (J).
Explanation:
Moon's gravity is about 1/6th of Earth's gravity. So weight (mg) is 1/6 of Earth weight. Mass remains same. g_moon ≈ 1.62 m/s², g_earth ≈ 9.8 m/s², ratio ≈ 1/6. Common fact in space science.
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