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.
1 answer:
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Answer:
The system loses 90 kJ of heat
Explanation:
We can answer the question by using the 1st law of thermodynamics, which states that:
where
is the change in internal energy of the system
is the heat absorbed by the system (positive if absorbed, negative if released by the system)
is the work done by the system (positive if done by the system, negative if done by the surrounding on the system)
In this problem, we have:
is the work done (negative, because it is done by the surrounding on the system)
is the increase in internal energy
Using the equation above, we can find Q, the heat absorbed/released by the system:
And the negative sign means that the system has lost this heat.