A ball of mass 0.5 kg moving at 4 m/s strikes a wall and rebounds at same speed. Impulse imparted is MCQ with Answer and Explanation
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Question #1
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A transformer with 100 primary turns and 500 secondary turns is a
Question #2
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Two electric bulbs rated 60W, 220V and 100W, 220V are connected strictly in series across a 220V supply. Which bulb will glow brighter?
Correct Answer: Option D
Explanation:
Resistance of a bulb is R = V^2 / P. The 60W bulb has a higher resistance than the 100W bulb. When connected in series, the exact same current (I) flows through both. The power consumed (which determines brightness) is given by P = I^2R. Since the 60W bulb has higher resistance (R), it consumes more power and glows brighter.
Resistance of a bulb is R = V^2 / P. The 60W bulb has a higher resistance than the 100W bulb. When connected in series, the exact same current (I) flows through both. The power consumed (which determines brightness) is given by P = I^2R. Since the 60W bulb has higher resistance (R), it consumes more power and glows brighter.
Question #3
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A cyclist moving at 18 km/h stops pedalling and comes to rest after 10 m due to friction. Deceleration is
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