The time period of a satellite in low Earth orbit is about MCQ with Answer and Explanation
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Question #1
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Work done by centripetal force in circular motion is:
Correct Answer: Option A
Explanation:
Centripetal force acts radially inward, perpendicular to tangential displacement. Work W = F·d·cosθ; θ=90° ⇒ cos90°=0 ⇒ W=0. No energy transfer occurs; speed remains constant in uniform circular motion. Memory tip: 'Perpendicular force ⇒ zero work'. Conceptual question testing work-energy understanding, common in competitive exams to identify misconceptions about circular motion.
Centripetal force acts radially inward, perpendicular to tangential displacement. Work W = F·d·cosθ; θ=90° ⇒ cos90°=0 ⇒ W=0. No energy transfer occurs; speed remains constant in uniform circular motion. Memory tip: 'Perpendicular force ⇒ zero work'. Conceptual question testing work-energy understanding, common in competitive exams to identify misconceptions about circular motion.
Question #2
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A transformer with 100 primary turns and 500 secondary turns is a
Question #3
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A 12 V battery is connected across a series combination of 2 Ω, 3 Ω, 5 Ω resistors. Current is
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