50 kg द्रव्यमान का एक लड़का, 10 सेकंड में 45 सीढ़ियां चढ़ता है। यदि प्रत्येक कदम की ऊंचाई 14 सेमी है। उसकी शक्ति ज्ञात करें। g = 10 ms-2 ले।

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RRC Group D Previous Paper 14 (Held On: 25 Oct 2018 Shift 1)
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  1. 315 ms
  2. 315 W
  3. 337.5 W
  4. 310.55 J

Answer (Detailed Solution Below)

Option 2 : 315 W
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सही उत्तर विकल्प 2 है, अर्थात 315 W

⇒ दिया गया है कि, निकाय का द्रव्यमान, m = 50 kg, h ऊँचाई है, t समय है। g गुरुत्वाकर्षण के कारण त्वरण है जो कि लगभग 10 ms-2 है। 

⇒ h = 45 × 14 = 630 cm = 6.30 m

⇒ t = 10 s, g = 10 ms-2

⇒ स्थितिज ऊर्जा = mgh = 50 × 10 × 6.30 = 3150 J है। (जहाँ J ऊर्जा/कार्य की इकाई है जो कि जूल है)

⇒ शक्ति = स्थितिज ऊर्जा / समय = ऊर्जा / समय = 3150 / 10 = 315 वाट।  (वाट शक्ति की इकाई है जो इकाइयों से अलग है)

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