Question

guys help please

three men pull on ropes attached to the top of a heavy object which is level with the ground. Man A is 6 ft tall, stands 6 ft away, 45 degrees N of E from the center of the object & exerts a force of 72 lb.Man B is 5 ft 6 in tall, is 6 ft away, 60 degrees N of W and pulls with a force of 60 lb.Man C is 5 ft tall, also stands 6 ft away, 30 degrees S of E & pulls with a force of 80 lb.Assuming the ropes to be attached to their shoulders which are 2/3 of their height from the ground,what is the horizontal resultant of these forces on the object.

Answer 1

@SolomonZelman

Answer 2

I would first find the actual height of shoulders of each guy, and then draw a pic

Answer 3

because we don't care about heads for this prob

Answer 4

how to find their actual size?

Answer 5

you are given a size of each guy, right?

Answer 6

And then you are given that up to shoulders, is 2/3 of the entire height.

Answer 7

yes, then

Answer 8

first tell me the shoulder-heights pliz

Answer 9

theres no given shoulder height

Answer 10

you are given that 2/3 of the body's height from the ground = shoulders level

Answer 11

(which is awkward, in a real sit.)

Answer 12

i didnt get it

Answer 13

K, you have man B lets say:
5 ft, 6"

(will convert this all to inches)
66"

then 2/3 of this is,
44"

which is 3ft 8".

So man B has his shoulders 3ft 8" from the ground.

Answer 14

(knowing that 1ft= 12 " )

Answer 15

Can you do the conversions for the remaining people?

Answer 16

I mean the shoulder-heights

Answer 17

okay i will, wait

Answer 18

man A = 6FT convert to inch = 72 and the 2/3 of it is 48":
man C = 5ft convert to inch = 60 and the 2/3 of it is 40"

Answer 19

@SolomonZelman

Answer 20

yes, that is correct

Answer 21

then whats next

Answer 22

Now we would need to make a picture I guess, (I am bad at physics)

```
3 men pull on ropes attached to the top of a heavy object which is level
w/ the ground. Man A is 4ft tall, stands 6 ft away, 45 degrees N of E from
the center of the object & exerts a force of 72 lb.Man B is 3 ft 8" tall, is 6
ft away, 60 degrees N of W and pulls with a force of 60 lb. Man C is 3ft 4" tall,
also stands 6 ft away, 30 degrees S of E & pulls with a force of 80 lb. What is
the horizontal resultant of these forces on the object.
```

(re-wrote without any shoulders, to simplify)

Answer 23

i have difficulties in analyzing what would be the image be or the free body diagram of the question