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Calculate the work done by a student in a book of 0.2 kg from the table and keeping it in shelf of 2meters of height |
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Answer» n :Calculate the WORK done by a student in a book of 0.2 kg from the table and keeping it in shelf of 2 meters of height ?Solution :★ ═════════════════════ ★Gravitational Potential Energy (P) : It is the energy stored in an object due to it's height above the earth .➠ P = mgHwhere ,m denotes mass of the object g denotes acceleration due to gravityH denotes height of the object from the earth's surface★ ═════════════════════ ★Work (W) : It is defined as product of component of force in the direction of displacement .Here , work done to move an object from ground to a shelf of 2 m is equals to gravitational potential energy . Note : UNITS of both work done and potential energy are equal ( JOULES )Mass of the book (m) = 0.2 kgHeight (H) = 2 mAcceleration due to gravity (g) = 9.8 m/s²Work done (W) = ? J➠ W = F × H ➠ W = (ma) × H [ ∵ F = ma ]➠ W = m × g × H ➠ W = 0.2 × 9.8 × 2➠ W = 3.92 J |
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