PLEASE ANSWER THESE FOR ME SOME MAY HAVE MORE THEN ONE ANSWE

PLEASE ANSWER THESE FOR ME. SOME MAY HAVE MORE THEN ONE ANSWER

If the material time derivative of a function is zero then that function: does not change with time at a given point in space, is constant when moving with the fluid, c) can change its value at different locations in space. If the partial time derivative of a function is zero then that function: does not change with time at a given point in space, is constant when moving with the fluid, can change its value at different locations in space. In a general unsteady flow, if the surface of a control volume moves with the fluid then: mass is constant within the control volume, density is constant within the control volume, the volume of the control volume is constant. In a general unsteady flow, if the surface of a control volume is fixed in space then: mass is constant within the control volume, density is constant within the control volume, the volume of the control volume is constant.

Solution

1. ans is (A) and (B). Steady flow implies no change at a point with time.

2. ans is (a) and (c) .in partial derivative the function can change with the change in location.

3. ans is (B) .moving boundary means change in K.E and P.E and involves boundary work also.

4. ans is (B) and (C) in unsteady flow, parametres change wrt time.mass keeps on changing