जर एखाद्या वस्तू वेग त्याच्या सुरुवातीच्या वेगाच्या दुप्पट झाला तर तिची गतिज ऊर्जा त्याच्या सुरुवातीच्या गतीज ऊर्जेच्या n पट होईल. n चे मूल्य किती आहे?

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RRB ALP Previous Paper 7 (Held On: 13 Aug 2018 Shift 2)
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  1. 3
  2. 4
  3. \(\frac{1}{2}\)
  4. 6

Answer (Detailed Solution Below)

Option 2 : 4
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योग्य उत्तर पर्याय 2, म्हणजे 4 आहे.

संकल्पना:

  • गतिज ऊर्जा (KE) : वस्तूच्या गतीमुळे त्याच्याकडे असलेल्या ऊर्जेला गतिज ऊर्जा म्हणतात.

\(KE = \frac{1}{2}m{v^2}\)
जेथे m = वस्तूचे वस्तुमान आणि v = वस्तूचा वेग

गणना:

सुरुवातीचा वेग u आणि अंतिम वेग v असू द्या.

दिलेल्या प्रश्नानुसार, वेग हा त्याच्या सुरुवातीच्या वेगाच्या दुप्पट होतो. याचा अर्थ V = 2u

आरंभिक गतिज ऊर्जा (KE) = 1/2 mu²

अंतिम गतिज ऊर्जा (KE') =1/2 mv² =1/2 m(2u)² =1/2 m × 4u² = 4 × 1/2 mu²

KE' = 4 × KE, जेथे n = 4

वेग दुप्पट केल्यावर गतिज ऊर्जा 4 पट होते.

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