Aperson is pushing a wheelbarrow along a ramp that makes an angle α = 33.0° with the horizontal. the wheelbarrow and load have a combined mass of 23.65 kg with the center of mass at the midpoint of the length l. what is the total force the person must apply so that the wheelbarrow remains horizontal on that ramp?

Explanation:

Since the wheelbarrow is maintained at horizontal position

so we can use Torque balance equation

Now force balance in Y direction we have

Now force balance in x direction we have

Now net force exerted by the person

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.