A ball of weight 400 N is placed on a smooth inclined plane of inclination 30o. To a point P on its circumference an inextensibl
e string is attached and tied to a point Q on the plane. If the radius of the ball is 2m and PQ = 2√3 m. Determine: i. The value of the tension T in the string. ii. The normal reaction exerted by the ball on the plane.
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Answer: The force needed is 140.22 Newtons.
Explanation:
The key assumption in this problem is that the acceleration is constant along the path of the barrel bringing the pellet from velocity 0 to 155 m/s. This means the velocity is linearly increasing in time.
The force exerted on the pellet is
F = m a
In order to calculate the acceleration, given the displacement d,
we will need to determine the time t it took for the pellet to make the distance through the barrel of 0.6m. That time can be determined using the average velocity of the pellet while traveling through the barrel. Since the velocity is a linear function of time, as mentioned above, the average is easy to calculate as:
This value can be used to determine the time for the pellet through the barrel:
Finally, we can use the above to calculate the force: