How much work is done when a hoist lifts a 220-kg rock to a height of 4 m? (use 9.8 m/s2 for the acceleration due to gravity.)

The work done is 8624 Joules

Explanation:

The work will be equivalent to the energy needed to move the body.

The work is a scalar magnitude represented by the symbol W and expressed in units of energy.

Formula to calculate work

Work is defined as the product of a force (F) applied to a body by its displacement (d) in the direction of this force:

W=F*d Equation 1

Data of problem:

mass=m=220kg, acceleration due gravity=9.8 m/s2, d=4m

F=Rock Weight= m*g=220kg *9.8=2156N

We replace the values of d and F in the equation (1)

W=2156N*4m

W=8624 N*m

W=8624  

The work done is 8624 Joules

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

current flows in a wire