3. В колбе объемом 1,2 л содержится 3*1022 молекул. Какова средняя Кинетическая энергия молекул?
2 answers:
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Answer:
Work done, W = 10195.92 Joules
Explanation:
Given that,
Mass of the crate, m = 170 kg
Distance, d = 10.2 m
The coefficient of friction,
Let W is the work done by the mover. It is given by in terms of coefficient of friction as :
W = 10195.92 Joules
So, the work done by the mover is 10195.92 Joules. Hence, this is the required solution.
<h3>Answer:</h3>
375 N
<h3>Explanation:</h3>Topic tested: Newton's Law of motion
The question is testing on the application of Newton's second Law of motion.
We are given;
- Mass of the football = 5 Kg
- Initial velocity of the football, Vf = 15 m/s
- Time taken to bring the ball to rest = 0.2 s
- Final velocity, Vo = 0 m/s ( since the ball went to rest)
We are required to determine the force exerted to bring it to rest.
- According to the Newton's second law of motion the resultant force and rate of change in momentum are directly proportion.
- Therefore;
Thus;
Force = 375 N
Hence, the force exerted on the ball by the receiver was 375 N