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JEE Main2012PhysicsLaws of MotionActual

Sand is being dropped on a conveyer belt at the rate of 2 ~kg per second. The force necessary to keep the belt moving with a constant speed of 3 ~ms ⁻¹ will be

Options

  1. A12 ~N
  2. B6 ~N
  3. Czero
  4. D18 ~N

Correct answer

B. 6 ~N

Step-by-step solution

Here, rate of fall of sand on conveyer belt, d m d t =2 ~kg ~s ⁻¹ Conveyer belt speed v=3 ~ms ⁻¹ Force F= ? F=v d m d t =3 2=6 ~N

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