An elephant lifts 300 kg log to a height of 3.0 meters in a time of 4.0 seconds. How much work does she do
The work done can be calculated using the formula:
Work = Force x Distance
The force exerted by the elephant can be calculated using the weight formula:
Force = Mass x Acceleration due to gravity
The mass of the log is given as 300 kg, and the acceleration due to gravity is approximately 9.8 m/s^2.
Force = 300 kg x 9.8 m/s^2 = 2940 N
The height is given as 3.0 meters.
Distance = 3.0 meters
Now we can calculate the work done:
Work = Force x Distance
Work = 2940 N x 3.0 meters
Work = 8820 N.m or Joules (J)
Therefore, the elephant does 8820 Joules of work in lifting the log.