Question

a man pulls a 50.0 kg box with a rope parallel to the ground he pulls the box 10.0 m about how much work has he done?

Answer 1

Work is force times distance. Here, force will be the weight of the box.

Answer 2

are you sure that weight can be force? and if it can can you explain?

Answer 3

so would it be 500J?

Answer 4

If there is no friction and no increase in elevation, there was no work.

Answer 5

ok but its a question of my review and the answer choices are
A.5j
B.0.2J
C.5,000J
D.500J
it doesn't 0 i think there is work

Answer 6

50 kg is the mass. Weight is mass times gravity.

Answer 7

ok so is it like this? 50 x 9.8=490
490 x 10=4900 os it would be C.?

Answer 8

Yep

Answer 9

yes

Answer 10

thank you wolfe8

Answer 11

@vjenny
It's easier to send someone a message if you tag them

like so @wolfe8

Answer 12

=)

Answer 13

You're welcome. And btw, weight IS a force. It is the pull of gravity on mass.

In science and engineering, the weight of an object is usually taken to be the force on the object due to gravity.
http://en.wikipedia.org/wiki/Weight

Answer 14

@wolfe8 is correct
Those new to physics find this concept confusing.
I myself was totally lost when I first learned it.

Answer 15

thanks for the tip @roadjester and ok yeah I get it now @wolfe8

Answer 16

Pulled horizontally, with no friction, the work is 0, regardless of the answers offered.

Answer 17

Work is \(F\Delta x\). In order to pull the box there has to be a force on the box.

Answer 18

It does not indicate any force was exerted.

Answer 19

Weight comes into play when being lifted against gravity or when causing friction to oppose motion.

Answer 20

I took time to respond earlier because of this. Work is 0 when it moves perpendicular to the direction of force. Since the force is downwards and the box moves horizontally, this question maybe mistaken.

Answer 21

umm ok so what do I do u mean im a bout to take this test is 10 min and the teacher told me specifically that there was going to be a question similar to this one

Answer 22

You know what, let's do it this way. The "officially correct" definition of work is \(\large W=F\Delta xcos\theta\)

Answer 23

Exactly. This when theta is 90 W is 0.

@vjenny I would suggest you talk to the teacher after the test if this question comes up and there were no right choices.

Answer 24

It says the rope is parallel to the ground. I have been assuming the ground is horizontal.

Answer 25

Good night, folks.

Answer 26

Good night @douglaswinslowcooper

Answer 27

Night.

Answer 28

wait so was there no work? @douglaswinslowcooper @wolfe8

Answer 29

Could you type the question again with punctuation please?

Answer 30

@vjenny

Answer 31

If there are no diagrams, we would have to say no since we assume the ground to logically be horizontal.

Answer 32

ok let me type the question again it says A man pulls a 50.0 kg box with a rope parallel to the ground he pulls the box 10.0 M about how much is work done?

Answer 33

A man pulls a 50.0 kg box with a rope parallel to the ground. This assumes the force, if any, is also parallel to the ground. He pulls the box a distance of 10.0m. So I'm going to take a shot in the dark and say theta=0.

@wolfe8 why did you say it was 90?

Answer 34

@vjenny I kinda meant, all punctuation. Unless the question itself was gramatically incorrect to begin with

Answer 35

Weight is downwards along the vertical axis, the movement is along the horizontal axis, so 90.

Answer 36

ah

Answer 37

gotcha

Answer 38

Yeah the question itself look incorrect. @.@ I kind of question your teacher haha.

Answer 39

its grammatically incorrect n ok let me go take the test and I think ill choose 500 J and lets see if I get it right!

Answer 40

so you're just winging it? not that good of an idea but meh. Your choice.

Answer 41

If you still have to choose I'd choose 5000 J assuming that somehow the ground is vertical.

Answer 42

lol

Answer 43

oops I meant 5,000 im tired I want to sleep lol ok well thanks guys

Answer 44

Maybe you should take the test during the day. Alright good luck and good night.