A flat plate is moving normal to its plane through a gas under the act

1.	A flat plate is moving normal to its plane through a gas under the action of constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true? (A) The resistive force experienced by the plate is proportional to v (B) The pressure difference between the leading and trailing faces of the plate is proportional to uv (C) The plate will continue to move with constant non-zero acceleration, at all times (D) At a later time the external force F balances the resistive force.
Answer» (A) The resistive force experienced by the plate is proportional to v (B) The pressure difference between the leading and trailing faces of the plate is proportional to uv (D) At a later time the external force F balances the resistive force.

A flat plate is moving normal to its plane through a gas under the action of constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true? (A) The resistive force experienced by the plate is proportional to v (B) The pressure difference between the leading and trailing faces of the plate is proportional to uv (C) The plate will continue to move with constant non-zero acceleration, at all times (D) At a later time the external force F balances the resistive force.

Answer»

(A) The resistive force experienced by the plate is proportional to v

(B) The pressure difference between the leading and trailing faces of the plate is proportional to uv

(D) At a later time the external force F balances the resistive force.

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