An airplane, flying horizontally at an altitude of 3 miles, passes directly over an observer. If the constant speed of the air
plane is 240 miles per hour, how fast is its distance from the observer increasing 45 seconds later? Hint: Note that in 45 seconds (three fourths times StartFraction 1 Over 60 EndFraction equals StartFraction 1 Over 80 EndFraction hour ), the airplane goes 3 miles.
1 answer:
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Answer:
Part a)
Part b)
Part c)
Explanation:
Part a)
As we know that force on the passenger while moving in circle is given as
now variation in force is given as
here speed is constant
Part b)
Now if the variation in force is required such that r is constant then we will have
so we have
Part c)
As we know that time period of the circular motion is given as
so here if radius is constant then variation in time period is given as
Answer:
(c) 97 dB sound intensity level
Explanation:
We have given the intensity of the loud car horn
We know that
Now the sound intensity level is given by , which is nearly equal to 97
So the sound intensity level will be 97 dB
So option (c) will be the correct option