Two 100 W, 200 V bulbs are connected in series across 200 V supply. Total power consumed is MCQ with Answer and Explanation
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The device that converts mechanical energy into electrical energy is
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The part of the eye that controls the amount of light entering is
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A particle moves with velocity v = 3t² + 2t. Its acceleration at t = 2 s is:
Correct Answer: Option D
Explanation:
Acceleration a = dv/dt = d(3t² + 2t)/dt = 6t + 2. At t = 2 s: a = 6(2) + 2 = 14 m/s². Differentiation of velocity gives instantaneous acceleration. Memory tip: a = dv/dt; for polynomial v(t), differentiate term by term. Tests calculus application in kinematics, common in advanced competitive exam questions.
Acceleration a = dv/dt = d(3t² + 2t)/dt = 6t + 2. At t = 2 s: a = 6(2) + 2 = 14 m/s². Differentiation of velocity gives instantaneous acceleration. Memory tip: a = dv/dt; for polynomial v(t), differentiate term by term. Tests calculus application in kinematics, common in advanced competitive exam questions.
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