How do I do this physics problem?
A person pushes a 16.0 kg shopping cart at a constant velocity for a distance of 26.0 m. She pushes in a direction 28.0° below the horizontal. A 58.0 N frictional force opposes the motion of the cart.
(a) What is the magnitude of the force that the shopper exerts?
N
(b) Determine the work done by the pushing force.
J
(c) Determine the work done by the frictional force.
J
(d) Determine the work done by the gravitational force.
J
Comments
a) Because the velocity is constant, the acceleration is zero. Because there is no acceleration, the net force is zero. The net force is the vector sum
Fnet = 0 = Fhorizontal + friction
So Fhorizontal = -Ffriction
So they are equal and opposite.
The horizontal component of the force is related to the force as
Fhorizontal = F*cos28
b) As I say in another of your questions,
W = F*d
in this case, I need to add that F and d need to be in the same direction, so use Fhorizontal.
c) W = Ffriction*d
d) W = F*d'
where F in this case is the weight of the cart and d' is the distance it moved vertically. Nothing is said about the cart being on a hill, so d' = ???
the galaxies rotate at speeds inconsistent with their obvious mass is since we do see it all. I am relating to it as being the theoretical Dark Matter. There are very powerful proofs that shows that darkish topic exist. One the is the inconsistent velocity of and obvious mass. darkish topic makes up approximately seventy five% to eighty% of the problem within the Universe...