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The amount of force required to accelerate 57kg skier with an acceleration of 4m/s² is 228N.
<h3>How to calculate force?</h3>
Force is a physical quantity that denotes ability to push, pull, twist or accelerate a body and which has a direction and is measured in a unit dimensioned in mass × distance/time².
The force applied on an object can be calculated using the following formula:
Force = mass × acceleration
According to this question, a skier with mass 57kg accelerates at 4m/s². The force required can be calculated as follows:
Force = 57kg × 4m/s²
Force = 228N
Therefore, the amount of force required to accelerate 57kg skier with an acceleration of 4m/s² is 228N.
Learn more about force at: brainly.com/question/1046166
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The angular acceleration of a pulley is described under the equation,
So things clearing,
b) For point B it is necessary to make a sum of Forces,
In this way,
(1)
For block 2, we have the following relationship,
(2)
So,
(3)
Substituting (1) and (2) in (3)
So,
<em>**Note that</em> 
c) For this point we need to use (1)
using (2)
An opera singer breaks a thin glass with only the use of her high frequency voice
