helicopter of mass 3000kg rises vertically at a constant speed of 25m/s if the acceleration due to gravity is10m/s2 ,determine the resultant force working on the helicopter
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Resultant force, F=ma
=3000*25
= 75000N
Are you calculating momentum or force?
The upward force required while moving at constant velocity (inatial frame) is equal to the weight, mg of the object, so that the work done in lifting the body is given by U=mgh.
Normal reaction R is given by
R= m(a+g)
From the question; a=0 m/s² while g= 10m/s². Therefore,
R = 3000(0+10)
= 30,000 N
Which just equal to mg. (No resultant force).
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The upward force required while moving at constant velocity (inatial frame) is equal to the weight, mg of the helicopter, so that the work done in lifting the helicopter is given by U=mgh.
Normal reaction force R is given by
R = m(g+a)
From the question; a=0 m/s² while g= 10m/s². Therefore,
R = 3000(0+10)
= 30,000 N.
Zero net force, since R= mg.
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