If a force of 10 N acts on a body and displaces it by 2 m in the direction of the force, the work done is:
A. 5 J
B. 12 J
C. 20 J
D. 0 J
Answer: Option C
Solution (By JKSSB Mock Tests)
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:
In nuclear reactions, the total mass of the products is slightly less than the total mass of the original reacting nuclei. This missing mass is known as the 'mass defect'. According to Einstein's mass-energy equivalence principle (E = mc²), this tiny amount of missing mass is converted into the tremendous energy released during the reaction.
Explanation:
Recoil is due to action-reaction pair: gun exerts forward force on bullet, bullet exerts backward force on gun. Newton's third law states for every action there is equal and opposite reaction. Conservation of momentum also explains recoil, but the immediate law is third law. Gun recoil velocity is calculated using conservation of momentum derived from third law.
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