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The Casing of a Rocket in Flight Burns up Due to Friction. at Whose Expense is the Heat Energy Required for Burning Obtained? the Rocket Or the Atmosphere? - CBSE (Science) Class 11 - Physics

ConceptVarious Forms of Energy : the Law of Conservation of Energy

Question

The casing of a rocket in flight burns up due to friction. At whose expense is the heat energy required for burning obtained? The rocket or the atmosphere?

Solution 1

Rocket

The burning of the casing of a rocket in flight (due to friction) results in the reduction of the mass of the rocket.

According to the conservation of energy: Total Energy (T,E) = Potential energy(P.E) + Kinetic Energy (K.E)

= mgh + 1/2 mv^2

The reduction in the rocket’s mass causes a drop in the total energy. Therefore, the heat energy required for the burning is obtained from the rocket.

Solution 2

Heat energy required for burning of casing of rocket comes from the rocket itself. As a result of work done against friction the kinetic energy of rocket continuously decreases – and this work against friction reappears as heat energy.

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APPEARS IN

NCERT Solution for Physics Textbook for Class 11 (2018 to Current)
Chapter 6: Work, Energy and Power
Q: 5.1 | Page no. 135
Solution The Casing of a Rocket in Flight Burns up Due to Friction. at Whose Expense is the Heat Energy Required for Burning Obtained? the Rocket Or the Atmosphere? Concept: Various Forms of Energy : the Law of Conservation of Energy.
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