A 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. How many kilowatts of power
is needed for the job?
been there, done that
http://www.jiskha.com/display.cgi?id=1418842081
I did that a lot of questions ago.
To determine the kilowatts of power needed for the job, we need to calculate the work done and then divide it by the time it takes to complete the task.
The work done can be calculated using the formula:
Work = Force × Distance
In this case, the force required to raise the pre-stressed concrete beam is its weight, which can be calculated using the formula:
Weight = Mass × Acceleration due to gravity
The acceleration due to gravity is approximately 9.8 m/s^2.
Given:
Mass = 475 kg
Distance = 10.0 m
Time = 24.0 s
Acceleration due to gravity = 9.8 m/s^2
First, let's calculate the weight of the pre-stressed concrete beam:
Weight = Mass × Acceleration due to gravity
Weight = 475 kg × 9.8 m/s^2
Next, let's calculate the work done:
Work = Weight × Distance
Finally, let's calculate the power:
Power = Work / Time
Now we can plug in the values and calculate the answer.