Study the free body diagram above. Which scenario below can best be described with this free body diagram? A. a cup is at rest o
n a table. B. a car coasts down a hill. C. a child drops a penny from the top of a building. Neglect air resistance. D. a bartender slides a glass of beer to a patron at the end of a bar. Neglect air resistance.
1 answer:
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Answer:
Explanation:
Assuming uniform spread of sound with no significant reflections or absorption. We know that sound intensity varies where r is the distance
Since intensity is given then when at 3 m
Since we have the constant then at 4m
Intensity,
Answer:
Emitted power will be equal to
Explanation:
It is given factory whistle can be heard up to a distance of R=2.5 km = 2500 m
Threshold of human hearing
We have to find the emitted power
Emitted power is equal to
So emitted power will be equal to
Explanation:
If the turntable starts from rest and is set in motion with a constant angular acceleration α. Let is the angular velocity of the turntable. We know that the rate of change of angular velocity is called the angular acceleration of an object. Its formula is given by :
............(1)
Using second equation of kinematics as :
Using equation (1) in above equation
In one revolution, (in 2 revolutions)
Hence, this is the required solution.