A construction site uses electric cranes to lift standard cargo containers from the ground to a high platform.
The builder has a choice of three different cranes: A, B, and C.
Each crane takes a different amount of time to lift the container. Look at the bar chart below showing the time taken:
Crane C takes 13 s to lift the container. On the bar chart, a bar for C is drawn up to the 13 s mark.
Calculate the mean time of the three crane lifts.
Explain which crane uses the most power to lift the same container to the platform.
One crane uses 75 000 J75\,000\text{ J}75000 J of energy during a 13 s lift. Calculate the power of this crane. Give your answer to 1 decimal place.
At another part of the site, a worker uses a manual winch to lift a load. Calculate the work done when a force of 5200 N is applied to raise the load through a vertical distance of 4.5 m.