What is the net work formula for lifting weights?

  • Thread starter Thread starter PepeF.
  • Start date Start date
  • Tags Tags
    Formula Net Work
PepeF.
Messages
16
Reaction score
0

Homework Statement



a weight lifter lifts a set of weights a vertical distance of 3.64 m.
if a constant net force of 394 N is exerted on the weights, how much net work is done on the weights ?

Homework Equations



i need net work formula

The Attempt at a Solution

 
Physics news on Phys.org
Hi PepeF! :smile:

work done = force "dot" distance :wink:

(W = ∫ F.dx)
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

B Why does the work done by a weightlifter result in a net energy loss?
Replies
24
Views
3K
Weight Transfer Formula?
Replies
9
Views
1K
Lifting a 30m 35te Spud Leg: Crane Weight Calculation
Replies
8
Views
2K
Total work done while pushing a wheelchair
Replies
4
Views
2K
How Much Rope is Needed for Towing a Plankton Net at a Specific Depth?
Replies
2
Views
2K
Understanding Net Energy Transfer Rate in Parallel Plate Setup
Replies
1
Views
1K
Equilibrium of Forces and Torques on Sawhorses Supporting a Person on a Board
Replies
6
Views
2K
Work Energy Theorem: particle, system of particles, rigid body
Replies
13
Views
4K
B Conceptually understanding change in potential energy with 0 net work
Replies
9
Views
2K
How can mass be measured independently of gravity?
Replies
12
Views
2K

Hot Threads

Recent Insights

Back
Top