Density help!!!!

Brian is no good at maths · 2011-01-02 00:57:06

Okay im kinda new to this as level maths at collage and got given work to do over the xmas hols and still havent done it D:

Its a density question im stuck on which i know some of you guys are probably to smart to even need to think about it anymore but any way the quest is:

celling
\/
__________
\ / both angles between celling and wire are 38 degrees
\ /
\ / 20N north east (same on other side but north west)
\ / << wire
\ /
|
|
---
| | <<< metal block
---

The tension on each wire is 20N
i) show that the weight W of the metal block is about 25N.

I got: 20sin(38) = 12.3 x 2 = 24.6 <<< right or no???

ii) the metal block has a volume of 2.9x10 (to the -4) m cubed ( read that hows its written and it will make sence) calculate the density of the metal????

How do I do it!?!?

Please it to me ages to draw it out

Cheers Bry

Bob · 2011-01-02 02:53:19

hi bry

First answer is correct!

So 'plug in' weight = 25 N and acceleration = 10 (approx should be ok here) to get the mass in kilos

then density from top formula.

Bob

ps you could make a picture in 'Paint', save as a GIF and do an image upload next time

Last edited by Bob (2011-01-02 02:55:47)

Brian is no good at maths · 2011-01-02 04:02:55

Beautiful!!!!! See its allways easy when you know how

And yes paint would be alot easier

Thank you so much, appreciate it

Bob · 2011-01-02 05:05:33

You're welcome,

Happy New Year!

Bob

Math Is Fun Forum

#1 2011-01-02 00:57:06

Density help!!!!

#2 2011-01-02 02:53:19

Re: Density help!!!!

#3 2011-01-02 04:02:55

Re: Density help!!!!

#4 2011-01-02 05:05:33

Re: Density help!!!!

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