- #1

simphys

- 322

- 45

- Homework Statement
- VP6.8.3

A pendulum is made up of a small sphere of mass 0.500 kg

attached to a string of length 0.750 m. The sphere is swinging back

and forth between point A, where the string is at the maximum angle of

35.0° to the left of vertical, and point C, where the string is at the maximum angle of 35.0° to the right of vertical. The string is vertical when

the sphere is at point B. Calculate how much work the force of gravity

does on the sphere (a) from A to B, (b) from B to C, and (c) from A to C.

- Relevant Equations
- work done: w = mgd, d=displacement or line integral of work

Hello guys, I was wondering if someone could provide me some help on this problem.

for (c), I know that it will be 0 as the amount of word done from A to B = the am of work done from B to C.

But, What I receive as seen in the picture is 2.11N Which is not correct..

In the first try I used a line integral because I thought of gravity being a variable force but it is actually the

but... once again, I get 2.11N whilst the answer is 0.6 something N

Can someone tell me what I am doing wrong please?

Thanks in advance!

for (c), I know that it will be 0 as the amount of word done from A to B = the am of work done from B to C.

But, What I receive as seen in the picture is 2.11N Which is not correct..

In the first try I used a line integral because I thought of gravity being a variable force but it is actually the

**angle that varies as it is a curved path.**But that doesn't matter as the force is constant and no matter the path, if there is a constant force we use W = mgd (if I'm not mistaking)but... once again, I get 2.11N whilst the answer is 0.6 something N

Can someone tell me what I am doing wrong please?

Thanks in advance!