Which statement is true about metals?
1 answer:
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The correct answer to the question is 2.27 i.e the acceleration of the body is 2.27
along the forward direction.
CALCULATION:
As per the question, the net external force on the propeller of model airplane F = 6.8 N.
The mass of the model air plane m = 3.0 kg
We are asked to calculate the acceleration of the air plane.
From Newton's second law of motion, we know that the net external force acting on a body is equal to the product of mass with acceleration of that body.
Mathematically force F = m × a
⇒
[ans]
The direction of acceleration is along the direction of force. Hence, the acceleration of the propeller is 2.27 along forward direction.
The work done by a force is given by:
where
F is the magnitude of the force
d is the distance covered by the object
is the angle between the direction of the force and the direction of motion
In our problem,
, 
and 
(because the force is parallel to the direction of motion), so the work done by the crane is
where
F is the magnitude of the force
d is the distance covered by the object
In our problem,