a crane lowers a girder into place at constant speed. consider the work wg done by gravity and the work wt done by the tension in the cable. which is true?

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16-11-2022
Physics

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a crane lowers a girder into place at constant speed. consider the work wg done by gravity and the work wt done by the tension in the cable. which is true?

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triptivt3 triptivt3 · Answer 1 · 2022-11-24T06:25:05+01:00

The work done by gravity ([tex]W_g[/tex]) and the work ([tex]W_t[/tex])done by the tension in the cable for lowering a girder into place at constant speed is same in magnitude. So, [tex]W_g = W_t[/tex].

What is work done?

The amount of force multiplied by the distance the thing travelled in the direction of the applied force is how much work is done on an object.

Work done is equal to force times distance. joule is the unit of work.

In the case of a crane lowers a girder into place at constant speed. gravitational force and tension of the cable acts in opposite direction with equal magnitude. So, the work done by gravity ([tex]W_g[/tex]) and the work ([tex]W_t[/tex])done by the tension in the cable for lowering a girder into place at constant speed is same in magnitude. So, [tex]W_g = W_t[/tex].

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