GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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spins around
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does not move
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moves in the same direction in which air blows
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moves in opposite direction in which the air is blown
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Detailed explanation-1: -But at the same time due to Newton’s third law of motion the fan will experience a force due to the air blown in a direction opposite to the direction in which the sail boat will experience the force due to the blown air.So, as a whole the system will be at rest and it will not move.
Detailed explanation-2: -Can a sailboat be propelled by air blown at the sails from a fan attached to the boat? Answer: No. When the fan pushes the sail by blowing air, the air also pushes the fan in the opposite direction.
Detailed explanation-3: -On a stationary sail-boat, air is blown at the sails from a fan attached to the boat (from inside the boat).
Detailed explanation-4: -No, From Newton’s 2nd law of motion we know that a body comes to acceleration when some external force is applied over the body. When the fan pushes the sail by the air, then air also pushes the fan in opposite direction. The fan is also part of the boat and hence boat cannot be propelled.