AP Police Constable previous year question
A block of mass 2 kg is lifted through 2 m from the ground. The potential energy of the block in joules at that height is (g = 9.8 ms -2 )
Asked in AP Police Constable Prelims: 2016 (06 Nov 2016) · Science
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Correct answer: (A) 39.2
The correct answer is option 1 i.e., 39.2.
CONCEPT:
Potential Energy: The energy possessed by a body by virtue of its position or
configuration is called potential energy .
Mathematically it can be written as
PE = mgh
Where, m = mass of the body, g = acceleration due to gravity and h = height of
the body
CALCULATION :
Given - Mass (m) = 2 kg, height (h) = 2 m
As we know that potential energy is equal to
⇒ PE = mgh
⇒ PE = 2 × 9.8 × 2 =39.2 J
हिंदी में प्रश्न
2 किग्रा द्रव्यमान के एक गुटके को जमीन से 2 मीटर ऊपर उठाया जाता है। उस ऊंचाई पर गुटके की स्थितिज ऊर्जा (जूल में) है (g = 9.8 ms⁻²)
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 39.2
सही उत्तर विकल्प 1 अर्थात् 39.2 है।
अवधारणा:
स्थितिज ऊर्जा (Potential Energy): किसी वस्तु द्वारा उसकी स्थिति या विन्यास के कारण संचित ऊर्जा को स्थितिज ऊर्जा कहते हैं।
गणितीय रूप से इसे इस प्रकार लिखा जा सकता है
PE = mgh
जहाँ, m = वस्तु का द्रव्यमान, g = गुरुत्वीय त्वरण और h = वस्तु की ऊंचाई
गणना:
दिया गया है - द्रव्यमान (m) = 2 kg, ऊंचाई (h) = 2 m
जैसा कि हम जानते हैं कि स्थितिज ऊर्जा बराबर है
⇒ PE = mgh
⇒ PE = 2 × 9.8 × 2 =39.2 J
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