Answer:
F = f from Newton’s first law.
Explanation:
since the desk is moved in a straight line at a constant speed, newton first law tell us that the two forces must be equal.
Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. since the table has been set in motion by the 400 N force, it will remain in motion unless it is been acted upon by an external force, and this means that the 400 N must be equal to the frictional force for it to have been in motion in the first instance.
Fluid mechanics deals with pressure and internal forces in the fluid. So the correct answer should be a) how fluids do work.
If you put two solids in contact, there will be a contact force created between them. Since Pressure = Force / Area, the correct answer should be b) exert pressure on each other.
The power added by all 75 of them is (539 - 322) = 217 MW .
The AVERAGE power of each improved turbine is
( 217 / 75 ) = 2.8933 MW = 2,893.3 KW/unit .