477
Question
the rotor of an helicopter exters an upward force of 5000N and gravity exerts a downward pull of 4000N
(i) what is the work done by th rotorswhen the helicopter has ascended by 100MD ?
(ii) what is work done by gravity during the displacement
the rotor of an helicopter exters an upward force of 5000N and gravity exerts a downward pull of 4000N
(i) what is the work done by th rotorswhen the helicopter has ascended by 100MD ?
(ii) what is work done by gravity during the displacement
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Solution
The rotor pushes the helicopter upwards due to which it moves upward.
Force by rotor = 5000 N (upward)
Displacement = 100 m (upward)
Work done by rotor = (5000)(100) = 500000 J
Force of gravity pulls the helicopter downward but the helicopter moves upward.
Force of gravity = -4000 N (negative sign comes because it is in downward direction)
Displacement = 100 m (upward)
Work done by gravity = (-4000)(100) = -400000 J
The rotor pushes the helicopter upwards due to which it moves upward.
Force by rotor = 5000 N (upward)
Displacement = 100 m (upward)
Work done by rotor = (5000)(100) = 500000 J
Force of gravity pulls the helicopter downward but the helicopter moves upward.
Force of gravity = -4000 N (negative sign comes because it is in downward direction)
Displacement = 100 m (upward)
Work done by gravity = (-4000)(100) = -400000 J
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