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Chapter 7: Q1P (page 170)

(I) What is the magnitude of the momentum of a 28-g sparrow flying with a speed of 8.4 m/s?

Short Answer

Expert verified

The magnitude of the momentum of the sparrow is \(0.24\;{\rm{kg}} \cdot {\rm{m/s}}\;\).

Step by step solution

01

Momentum

The magnitude of the momentum of any object is equal to the product of the mass and the speed of the object.

02

Given data

The mass of the sparrow is \(m = 28\;{\rm{g}} = 0.028\;{\rm{kg}}\).

The speed of the sparrow is \(v = 8.4\;{\rm{m/s}}\).

03

Calculation of the magnitude of the momentum

The magnitude of the momentum of the sparrow is calculated below.

\(\begin{array}{c}P = mv\\ = \left( {0.028\;{\rm{kg}}} \right) \times \left( {8.4\;{\rm{m/s}}} \right)\\ = 0.24\;{\rm{kg}} \cdot {\rm{m/s}}\;\end{array}\)

Hence, the magnitude of the momentum of the sparrow is \(0.24\;{\rm{kg}} \cdot {\rm{m/s}}\;\).

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Suppose the force acting on a tennis ball (mass 0.060 kg) points in the \({\bf{ + x}}\) direction and is given by the graph of Fig. 7鈥�33 as a function of time.

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