यदि कोई मशीन 'L' भार उठाती है और भार द्वारा तय की गई दूरी 'Ld' है, तो भार द्वारा किया गया कार्य __________ होगा।

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 3)
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  1. L × Ld 
  2. \(\rm \frac{L}{Ld}\)
  3. \(\rm \frac{Ld}{L}\)
  4. \(\rm \frac{1}{L \times Ld}\)

Answer (Detailed Solution Below)

Option 1 : L × Ld 
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= अवधारणा:

किया गया कार्य:

  • गति की दी गई दिशा में किसी वस्तु पर किया गया कार्य, बल, विस्थापन और कोण की कोज्या के गुणनफल के बराबर होता है।
  • सूत्र, किया गया कार्य, W = Fscosθ, जहाँ F = बल, s = विस्थापन, θ = विस्थापन और बल के बीच का कोण।
  • किए गए कार्य की SI इकाई जूल (J) होती है।

गणना:

यदि कोई मशीन 'L' भार को पार करती है और भार द्वारा तय की गई दूरी Ld है,

किया गया कार्य, W = Fscosθ

यहाँ, θ = 0º, cos0º = 1

अत: किया गया कार्य W = Fs

W = L × Ld

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