Just a quick question which i dont seem to get the right answer for.(adsbygoogle = window.adsbygoogle || []).push({});

"A parent holds a small child in a swing so that the angle of the swing support is at 20 degrees to the vertical.The child's weight is 200N and the swing seat weighs 50N.What horizontal force must the parent apply"

I have drawn out what it think the vector diagram should look like.

http://img10.exs.cx/img10/1613/diagram6na.gif

I don't think its right.

Assuming that it is .. we would need to use sin/cos/tan. We have both the adjacent and the opposite.So that means we would need to use "Tan"

Tan 70 = 250/adjacent

250/Tan 70 = adjacent (horizontal) which would = 90.99 N .. the answer in the book however is 72.8 N ....

Some help please!

Regards,

Mo

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: More vectors

**Physics Forums | Science Articles, Homework Help, Discussion**