Calculating Power Output of a Weightlifter

AI Thread Summary
To calculate the power output of a weightlifter lifting 250 kg over 2.00 m in 2.00 seconds, the correct formula for work is Work = mass x gravity x height (W = m*g*h). The gravitational force (g) is approximately 9.81 m/s², which must be included in the calculation. The correct work done is 250 kg x 9.81 m/s² x 2 m, resulting in 4905 J. Dividing this work by the time of 2 seconds gives a power output of 2.45 kW. Including the gravitational force is essential for accurate calculations.
lonlyincolleg
Messages
3
Reaction score
0

Homework Statement


A weightlifter is able to lift 250 kg 2.00m, in 2.00s. What is his power output?


Homework Equations


W=M x N
P = W/Change t


The Attempt at a Solution


250 x 2 = 500 (I thought that this was work) so then I divided by time (2.00s) to get power. The answer is not right. It should be 2.45 kW. Please tell me what I am doing wrong.
 
Physics news on Phys.org
Work = m*g*h, you missed a "g" in there, so you are off by a factor of 9.81
 
I got it. thank you!
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

What is the Power Output of Gravity?
Replies
6
Views
2K
How many crates can you load in a minute with different average power outputs?
Replies
1
Views
2K
Power output of a intercooler and turbocharger
Replies
1
Views
2K
Calculate Avg Power Output for 75kg Person Walking 100ft in 3min
Replies
9
Views
2K
Determining power output at different time intervals
Replies
4
Views
2K
Calculating Solar Panel Area Needed for a 1MW Power Output
Replies
4
Views
2K
Calculating the power output from a persons mouth
Replies
3
Views
2K
Climbing a ladder in an elevator
Replies
12
Views
2K
Solving Physics Homework: Power Output of Heater
Replies
9
Views
2K
Check my answer for power output question
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top