geometric similarity Watch

wilson dang
Badges: 7
Rep:
?
#1
Report Thread starter 2 years ago
#1
in this question , Lm / Lp = 1/ 6 ? or Lp / Lm = 1/6 ? Lp = length of prototype , Lm = Length of model



i really have no idea... can someone help please?
0
reply
natninja
  • Careers Forum Helper
Badges: 20
Rep:
?
#2
Report 2 years ago
#2
(Original post by wilson dang)
in this question , Lm / Lp = 1/ 6 ? or Lp / Lm = 1/6 ? Lp = length of prototype , Lm = Length of model



i really have no idea... can someone help please?
Lm/Lp = 1/6
0
reply
wilson dang
Badges: 7
Rep:
?
#3
Report Thread starter 2 years ago
#3
(Original post by natninja)
Lm/Lp = 1/6
can you explain why are you so sure that Lm/Lp = 1/6 ????
0
reply
natninja
  • Careers Forum Helper
Badges: 20
Rep:
?
#4
Report 2 years ago
#4
(Original post by wilson dang)
can you explain why are you so sure that Lm/Lp = 1/6 ????
because the model is obviously going to be smaller
0
reply
wilson dang
Badges: 7
Rep:
?
#5
Report Thread starter 2 years ago
#5
(Original post by natninja)
because the model is obviously going to be smaller
Do you mean the model can be only smaller, and can't be larger than prototype??

Sent from my C6502 using Tapatalk
0
reply
natninja
  • Careers Forum Helper
Badges: 20
Rep:
?
#6
Report 2 years ago
#6
(Original post by wilson dang)
Do you mean the model can be only smaller, and can't be larger than prototype??

Sent from my C6502 using Tapatalk
Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
0
reply
wilson dang
Badges: 7
Rep:
?
#7
Report Thread starter 2 years ago
#7
(Original post by natninja)
Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,
Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?

Sent from my C6502 using Tapatalk
0
reply
wilson dang
Badges: 7
Rep:
?
#8
Report Thread starter 2 years ago
#8
(Original post by natninja)
Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?
0
reply
natninja
  • Careers Forum Helper
Badges: 20
Rep:
?
#9
Report 2 years ago
#9
(Original post by wilson dang)
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,
Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?

Sent from my C6502 using Tapatalk
Can you think of a sensible reason for building a model bigger than the prototype?
0
reply
wilson dang
Badges: 7
Rep:
?
#10
Report Thread starter 2 years ago
#10
(Original post by natninja)
Can you think of a sensible reason for building a model bigger than the prototype?
No, but, I saw the question like this, I doubt that is that similar to the previous case, which the model is smaller??

Sent from my C6502 using Tapatalk
0
reply
wilson dang
Badges: 7
Rep:
?
#11
Report Thread starter 2 years ago
#11
(Original post by natninja)
Can you think of a sensible reason for building a model bigger than the prototype?
when the scale ration is 6: 1 , does it mean the Lm / Lp = 6 , which model is 6 times larger than P , or Lp/ Lm = 6 , which means prototype is 6 times bigger than model ????
0
reply
natninja
  • Careers Forum Helper
Badges: 20
Rep:
?
#12
Report 2 years ago
#12
(Original post by wilson dang)
when the scale ration is 6: 1 , does it mean the Lm / Lp = 6 , which model is 6 times larger than P , or Lp/ Lm = 6 , which means prototype is 6 times bigger than model ????
It requires you to apply a small amount of common sense. I don't see any reasonable reasons to make a model bigger than the thing so the model is clearly the smaller of the two.
1
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Brunel University London
    Postgraduate Open Evening Postgraduate
    Wed, 22 May '19
  • University of Roehampton
    Postgraduate Open Evening Postgraduate
    Wed, 22 May '19
  • Sheffield Hallam University
    Postgraduate Open Day Postgraduate
    Wed, 22 May '19

How did your Edexcel GCSE Maths Paper 1 go?

Loved the paper - feeling positive (29)
22.83%
The paper was reasonable (53)
41.73%
Not feeling great about that exam (25)
19.69%
It was TERRIBLE (20)
15.75%

Watched Threads

View All