
Concept explainers
(a)
To Show:
Path of the particle is circle of radius R.
(a)

Explanation of Solution
Given:
Mass of a particle
Position of a particle is given by
Radius of circle
Calculation:
To show that particle is moving in a circle take a dot product of
It is the equation of the circle with radius R and center at the origin. It is given, R
Conclusion:
It is shown that the path of this particle is the circle of radius R and center at the origin.
(b)
To Compute:
The velocity vectors.
To Show
:
(b)

Explanation of Solution
Given:
Mass of a particle
Position of a particle is given by
Radius of circle
Calculation:
Hence,
Conclusion:
It is shown that
(c)
To compute:
The acceleration vector
To Show:
The acceleration is directed towards the origin and has magnitude
(c)

Explanation of Solution
Given:
Calculation:
Hence,acceleration is directed towards the center.
Magnitude of acceleration is
But
Conclusion:
It is shown that the acceleration vector is directed towards the origin and has magnitude
(d)
To Find:
The magnitude and direction of net force acting on the particle.
(d)

Answer to Problem 130P
Magnitude of net force acting on the particle is
Explanation of Solution
Given:
Mass of a particle
Radius of circle
Formula Used:
Calculation:
The only force acting on the particle in a circular motion is the centripetal force. Hence the magnitude of the total force on the particle is
The direction of force is equal to the direction of centripetal acceleration i.e. towards the center, along the radius.
Conclusion:
The magnitude of the net force acting on the particle is
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Chapter 5 Solutions
Physics for Scientists and Engineers
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