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From the goIIT Archives - Chemical Kinetics
in a reaction like following aA + bB --> pP + sS
has actually four rates,
(-rA) = Rate of decompostion of reactant A (minus sign denotes reactantant and that it is decomposing that is getting exhausted and getting converted to products)
(-rB) = Rate of decompostion of reactant B   [cont...]

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Kinematics
The Rigid Body. A body in which the distance between any two points does not change due to the application of external forces is called a rigid body (figure 1).
Motion of a Rigid Body. Various types of motions of a rigid body can be grouped mainly into three categories viz. Translation, fixed axis rotation and the general plane motion (more...)
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