A grocer lifts an 8.0-kg carton from the floor to a height of 0.80 m in 5 sec. Calculate the power of man.
Have you learned that
Work = Force x distance?
Have you learned that
Power = Work/Time ?
Put them both together for the answer.
The force is the weight, which M g.
These are things you should know by now.
To calculate the power of the man, you will need to use the formula:
Power = Work / Time
First, let's calculate the work done by the man to lift the carton.
The work done is given by the equation:
Work = Force x Distance
In this case, the force can be calculated using Newton's second law:
Force = Mass x Acceleration
Given that the mass of the carton is 8.0 kg and the acceleration due to gravity is 9.8 m/s^2, we can calculate the force:
Force = 8.0 kg x 9.8 m/s^2 = 78.4 N
Next, we need to calculate the distance the carton is lifted. The distance is given as 0.80 m.
Now we can calculate the work done:
Work = Force x Distance = 78.4 N x 0.80 m = 62.7 J
Finally, we can calculate the power:
Power = Work / Time = 62.7 J / 5 s = 12.5 W
Therefore, the power of the man is 12.5 Watts.