Can the internal forces acting among the parts of a system change the linear momentum of the system ?
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The negative of the work done by the conservative internal forces on a system equals the change in
(c) potential energy Explanation:- The Potential energy of a system is due to its configuration. When conservative internal forces do work on the system, the potential energy changes to kinetic energy. So...
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The work done by all the forces (external and internal) on a system equals the change in
(b) kinetic energy Explanation:- Though work done by external forces will change the total energy of the system, work done by the internal forces will increase kinetic energy only. So when both...
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Consider the following two statements : (A) Linear momentum of a system of particles is zero.
(d) B implies A but A does not imply B. Explanation: If (B) is true, then ½Σimivi² = 0. In this equation v is magnitude of velocity and m is mass. Mass cannot be zero and...
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Internal forces can change (a) the linear momentum but not the kinetic energy
(b) the kinetic energy but not the linear momentum Explanation: If there is no external force the linear momentum is conserved because the velocity of CoM is not changed, so internal forces...
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Consider the following two statements : (A) Linear momentum of the system remains constant.
(d) B implies A but A does not imply B. Explanation: Position of CoM is given by R =(1/M)Σimiri . If we differentiate both sides w.r.t. time t, we get, dR/dt =(1/M)Σimi.dri/dt...
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If the external forces acting on a system have zero resultant, the centre of mass
(b) must not accelerate (c) may move Explanation: If there is no/zero resultant force acting on a system, there will be no acceleration. Hence (b), not (d). If it is already moving with a...
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A block moving in air breaks in two parts and the parts separate (a) the total momentum must be conserved
(a) the total momentum must be conserved (d) the total kinetic energy must change. Explanation: When the block moving in air breaks into two parts due to internal forces, the speeds of the...
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Give one example for each of the following types of inter-particle forces (a) London dispersion forces (b)Dipole-Dipole forces
(a) noble gases. (b) between HCl molecules. (c) Between water molecules or HF molecules. (d)Between NO3 - and water molecules
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Express the change in internal energy of a system when:- No work is done on the system, but ‘q’ amount of heat is taken out from the system
Δ U = - q, thermally conducting walls
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Express the change in internal energy of a system when:- ‘w’ amount of work is done by the system and ‘q’ amount of heat is supplied to the system.
Δ U = q – w, closed system
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