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The Porter does no work because the force applied is perpendicular to the displacement
Explanation:
The work done by a force applied to an object is given by:
where
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and the displacement of the object
From the formula, we notice that:
- The work done is maximum when the force is parallel to the displacement (because )
- The work done is zero when the force is perpendicular to the displacement (because )
In this problem, Porter is carrying the suitcase: this means that the force he is applying is upward (to balance the weight of the suitcase, pulling down), while the displacement is in the horizontal direction: therefore, force and displacement are perpendicular, so the work done is zero.
Learn more about work:
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Ok I’ll help you I think 20 -192 = 1928172 then ur divided • by 181$1 then u get 244141551611671718181919191827337533535352526
The intensity of the sound wave is defined as the ratio between the power of the wave and the area through which the wave passes:
where
I is the intensity
P is the power
A is the area
If we use the data of the problem,
and
, we find the intensity of the sound wave: