Can a measurement be exact? No
The law that accounts for that exact statement is the law that says that
most people don't understand these things very well.
A better statement is:
<span>"The gravitational forces between the Sun and each planet cause each planet
to move in an elliptical path."<span>
The laws that account for that behavior are:
-- Newton's second law of motion: (Force) = (mass) x (acceleration)
-- Newton's law of universal gravity</span></span>
Since it was stated that it must move at constant
velocity, so the only force it must overpower is the frictional force.
So the equation is:
F cos θ = Ff
F cos 36 = 65 N
F = 80.34 N
<span>So the nurse must exert 80.34 N of force</span>
It would be negative regardless of what you define as a positive direction.
