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

1. If we increase the distance to twice it's original value, the light intensity is reduced by one-fourth, the light intensity would be:
I0/4

2. rms magnetic field is inversely proportional to distance, so the new rms magnetic field would be:
B0/2

3. average energy density is inversely proportional to the square of the distance, so the new average energy density is:
E0/4