Final answer:
To calculate the work done by gravity and tension in lifting a girder, you can use the formulas work = force x distance. The force of gravity can be calculated using the weight = mass x acceleration due to gravity formula.
Step-by-step explanation:
To calculate the work done by gravity, we can use the formula:
work = force x distance
Since the girder is lifted vertically, the force of gravity is equal to the weight of the girder, which is given by the formula:
weight = mass x acceleration due to gravity
To calculate the work done by tension, we can use the formula:
work = force x distance
Where the force is the tension in the cable, and the distance is the distance the girder is lifted.
Using these formulas and the given values, we can calculate the work done by gravity and tension.