Answer:
The supersonic jet has a greater acceleration
I know what it is but its hard to see
Almost 3 times fast than normal pulley system
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Answer:

Explanation:
The distance traveled by the sound wave between the beats of the wing is its wavelength, since it is defined as the distance traveled by a periodic disturbance that propagates in a cycle, is defined as:

Where v is the speed of sound and f the frequency of the wing beats

Answer with Explanation:
We are given that
Mass of adult,M=75 kg
Length of board=l=9 m
Mass of child=m=25 kg
a.Let pivot placed at point O so that the board is balanced ignoring the board's mass
Moment about the point O





Hence, the pivot placed at 2.25 m from the adult.
b.Mass of board=m''=15 kg
Center of board=
Moment about point O





Hence, the pivot point is 2.5 m from the adult.