0.5 किलोग्रॅम बॉलचा वेग 4 m/s वरून 8 m/s पर्यंत वाढवण्यासाठी किती कार्य केले जाते?

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. 8 J
  2. 12 J
  3. 16 J
  4. 4 J

Answer (Detailed Solution Below)

Option 2 : 12 J
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Detailed Solution

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संकल्पना:

केलेले कार्य:

हे बल आणि विस्थापनाचे बिंदू उत्पादन आहे.

केलेले कार्य (W) = बल (F) x विस्थापन (S)

गतिज ऊर्जा:

कणाच्या वेगामुळे उद्भवणाऱ्या ऊर्जेला गतिज ऊर्जा म्हणतात.

हे K.E. द्वारे दर्शविले गेले आहे

\(K.E=\frac{1}{2}mV^2\)

जेथे m = कणांचे वस्तुमान आणि V = कणांचा वेग.

कार्य ऊर्जा प्रमेय :

प्रणालीवर सर्व बलांनी केलेले कार्य प्रणालीच्या गतिज ऊर्जेमध्ये बदल करण्यासारखेच आहे.

सर्व बलांनी केलेले कार्य (W) = अंतिम K.E - आरंभिक K.E

गणना :

दिलेले आहे की:

प्रारंभिक वेग (u) = m मीटर/सेकंद, अंतिम वेग (v) = m मीटर/सेकंद आणि

वस्तुमान (m) = 0.5 किलो

कार्य-ऊर्जा प्रमेय लागू करणे:

केलेले कार्य = गतिज ऊर्जेमध्ये बदलः

ΔK.E = (K.E)2 - (K.E)

\(\Rightarrow \frac{1}{2}m(v^2-u^2)\)

\(\Rightarrow \frac{1}{2}\times\;0.5\times(8^2-4^2)\)

∴ ΔK.E हे 12 J आहे.

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