Question

Some workers on a building site have set up an electric winch to lift a bucket with tiles to the roof. If the bucket and tiles weigh 500 N. How much energy is spent in lifting the tiles 20 m from the ground to the roof?

Answer 1

Given: Some workers on a building site have set up an electric winch to lift a bucket with tiles to the roof. If the bucket and tiles weigh 500 N. It lifts the tiles 20 m from the ground to the roof.

To find: Energy spent in lifting the tiles

Explanation: When the tiles are lifted from the ground to the roof, potential energy is stored in them and the magnitude of potential energy is the energy spent in lifting the tiles.

Total weight of bucket and tiles= 500 N

Height from ground to roof= 20 m

The formula for potential energy is:

Energy= Weight* Height

= 500 * 20

= 10000 J

= 10 kJ ( 1 kJ = 1000 J)

Therefore, energy spent in lifting the tiles is 10000 J or 10 kJ.