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खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता विषय पर विशेषज्ञों का मंथन

खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता  विषय पर विशेषज्ञों का मंथन पर्यावरणीय स्थिरता मानव समाज के निरन्तर अस्तित्व, समृद्धि और स्वास्थ्य के लिए मूलभूत शर्त है। हमारी न्यू जनरेशन को स्पीड और टेक्नोलॉजी पर ध्यान केंद्रित करना होगा ताकि भविष्य को सुनहरा बनाया जा सके। उक्त विचार मुख्य अतिथि श्री एमपी सिंह, प्रधान मुख्य अभियंता, केंद्रीय विद्युत प्राधिकरण विद्युत मंत्रालय भारत सरकार, नई दिल्ली ने व्यक्त किए श्री सिंह भूपाल नोबल्स स्नातकोत्तर महाविद्यालय में भूविज्ञान विभाग द्वारा "खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता" विषय पर आयोजित दो दिवसीय राष्ट्रीय कॉन्फ्रेंस के समापन पर बोल रहे थे। दो दिवसीय राष्ट्रीय कान्फ्रेंस का भव्य समापन सम्मानित अतिथि प्रो विनोद अग्रवाल सदस्य, भारत सरकार नई दिल्ली स्थित MOEFCC की विशेषज्ञ मूल्यांकन समिति, (सि एण्ड टीपी) अपने उद्बोधन में कहा कि पर्यावरण स्थिरता सरकार और समाज दोनों की जिम्मेदारी है। वर्तमान में खनन उद्योग विभिन्न प्रावधानों एवं कानूनों के तहत कार्य कर रहा है ताकि पर्यावरण को सुरक्षित रखा जा सके। आयोजन सचिव डॉ. हेमंत सेन न...
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Newton’s second law | Mechanics

Newton’s second law 

  • According to this law the rate of change of momentum is directly proportional to the applied force, and the change in momentum is always takes place in the direction of applied force.
  • F ∝ (dp / dt)    ⇒    F = k (dp / dt)
  • Here F is applied force, p is linear momentum and k is constant of proportionality.
  • In S.I. k = 1
  • ∴   F = dp / dt
  • ∵   p = mv
  • ∴   F = d(mv) / dt    ⇒    F = m (dv / dt)    ⇒    F = ma    (∵ a = dv / dt)
  • Thus Newton’s second law gives the quantitative definition of force.
  • If ax, ay and az are the components of acceleration in x, y and z directions respectively, then
  • F = m (ax i + ay j + az k) = (max) i + (may) j + (maz) k
  • F = Fx i + Fy j + Fz k
  • Since Newton’s first and third laws can be derived from second law, and hence this law is the real law of motion or the most fundamental law of motion.
  • ∵     a = F / m
  • ∴     Acceleration ∝ 1 / Mass
  • It means greater is the mass of the body, smaller is the acceleration produced by it.
  • Since mass is the measure of inertia of the body, therefore the mass given by above equation is known as inertial mass.
  • Acceleration produced in the body depends only on its mass, not on the initial or final velocity.

Unit of force

  • Unit of force = Unit of mass × Unit of acceleration
                               = kg  ×  m/s2 = N (newton)
  • CGS unit of force is dyne
  • 1 N = 105 dyne

Dimensional formula

  • Dimension formula of force is [MLT-2]

Accelerated motion

  • If in a motion, only the magnitude of velocity of the body changes, then in this type of motion the force is applied either along the direction of motion or opposite to the direction of motion.
  • If only the direction of the motion of the body changes, then in this type of motion the force is always applied at right angles to the direction of motion of the body. Circular motion is the example of this type of motion.

To know more about Newton's second law of motion please click on https://youtu.be/ePtqiWUZEu0
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