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Can someone tell me what 900 to the power of -6 is please?

mathskillsme

00000

(edited 9 years ago)

Reply 1

username991125

900x10^-6?

=0.0009.

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Reply 2

Simes

900^-6
= 1 ÷ 900⁶
= 1 ÷ ( 5.31 x 10¹⁷ ) or 1 ÷ 531,441,000,000,000,000
= 0.000 000 000 000 000 001 881 676

I think you may have got something wrong somewhere.

Reply 3

username1560589

I would suggest using a calculator if there's no reason not to.

Reply 4

uberteknik

Original post by mathskillsme

I need to do a formula to work out slope and deflection on a beam.

The value 'I' has been given to us but not in standard form.

It says 900 to the power of -6.

I can't for the life of me get this right the numbers aren't working!

Thanks in advance.

Is it 900 to the power of -6 ?

or have you missed out x10

in which case the question should be: what is 900x10^-6 ?

The latter is a standard physics and engineering notation rounding the power to the nearest multiple of 3.

The answers will be very different.

(edited 9 years ago)

Reply 5

username991125

I assume I = second moment of area, so it assume I = 900x10^-6 mm^4

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Reply 6

mathskillsme

Hi, thanks

(edited 9 years ago)

Reply 7

mathskillsme

Original post by yennibubs

I assume I = second moment of area, so it assume I = 900x10^-6 mm^4

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Yes you are absolutely correct, this is the fo

(edited 9 years ago)

Reply 8

username1560589

Original post by mathskillsme

Hi, thanks for all the replies!

I originally had 0.0009 m but it isn't working in my calculations.

The only bit I have to do is the first sentence of the problem : It's supposed to say 50Kn load instead of 40Kn.

Thanks!

There's where you went wrong. It says 900 x 10^-6 not 900^-6.

Reply 9

username991125

Original post by mathskillsme

Yes you are absolutely correct, this is the formula I need to use.

I don't understand why E is 200 Gn/m2. I think this could be Kn and the sheet is wrong?

I just can't put it in the equation and get a decent answer.

No no. The modulus of elasticity is 200GPa so the sheet is right.
Sorry not exactly in the best position to help you fully because I'm out and about right now. Not very helpful :erm:

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Reply 10

mathskillsme

Original post by yennibubs

No no. The modulus of elasticity is 200GPa so the sheet is right.
Sorry not exactly in the best position to help you fully because I'm out and about right now. Not very helpful :erm:

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Thanks, I believe 1 Gpa is equal to 1 Kn/mm(2) though?

Not 1 Giga Newton?

Really confused!

Reply 11

username991125

Original post by mathskillsme

Thanks, I believe 1 Gpa is equal to 1 Kn/mm(2) though?

Not 1 Giga Newton?

Really confused!

1Pa = 1N/m2
1GPa = 1GN/m2 = 1kN/mm2
200GPa = 200GN/m2

Edit: sorry made a few edits. Hope you manage to see the right one haha

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(edited 9 years ago)