A 4 kg disk slides over level ice toward the | vedclass

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(A) The momentum of an object is given by the product of its mass and its velocity $(p = mv)$.Before the collision,the disk is moving directly east wi

Vedclass · Accepted Answer

$-4$

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(A) The momentum of an object is given by the product of its mass and its velocity $(p = mv)$.Before the collision,the disk is moving directly east with a velocity of $1 \ m/s$. The eastward component of its initial momentum is $p_{i,E} = 4 \ kg 	imes 1 \ m/s = 4 \ kg \cdot m/s$.After the collision,the disk moves directly north. Since it has no velocity component in the eastward direction,the eastward component of its final momentum is $p_{f,E} = 0 \ kg \cdot m/s$.The change in the eastward component of the momentum is given by $\Delta p_E = p_{f,E} - p_{i,E}$.Substituting the values,we get $\Delta p_E = 0 - 4 = -4 \ kg \cdot m/s$.

$A$ $4 \ kg$ disk slides over level ice toward the east at a velocity of $1 \ m/s$,as shown. The disk strikes a post and rebounds toward the north at the same speed. The change in the magnitude of the eastward component of the momentum of the disk is ............. $kg \cdot m/s$.

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