Pressure caused by block

  • Thread starter tehmatriks
  • Start date
  • #1
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Homework Statement


Calculate pressure on the table caused by a block of mass 4 kg and acceleration due to gravity is 9.8 m s-2


Homework Equations


pressure = force/mass


The Attempt at a Solution


anyway, i get to, 39.2/(0.03)(0.05) and i get 26,133.33333
insteads of the actual answers which is 2.613 x 104

my question, how do i get the actually answer, thanks in advance
 

Answers and Replies

  • #2
gneill
Mentor
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Calculate pressure on the table caused by a block of mass 4 kg and acceleration due to gravity is 9.8 m s-2
You haven't specified the dimensions of the box. Pressure involves force distributed over an area.

Homework Equations


pressure = force/mass

No, pressure = force/area

You should also have an equation that relates the weight of an object to its mass in the gravitational field.

The Attempt at a Solution


anyway, i get to, 39.2/(0.03)(0.05) and i get 26,133.33333
insteads of the actual answers which is 2.613 x 104

my question, how do i get the actually answer, thanks in advance

Powers of ten? Scientific notation?
 
  • #3
Doc Al
Mentor
45,093
1,398
anyway, i get to, 39.2/(0.03)(0.05) and i get 26,133.33333
insteads of the actual answers which is 2.613 x 104
I don't understand the issue. Those answers match!
26,133.33333 is the same as 2.613 x 104 (rounded off, of course)
 
  • #4
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I don't understand the issue. Those answers match!
26,133.33333 is the same as 2.613 x 104 (rounded off, of course)

right, just how do i round that off to the si units thing

and gneill, yea, pressure = force/area is what i meant, i know how to do these man, just need to know to get the answer to how it is in the actual book which is 2.613 x 104
 
  • #5
gneill
Mentor
20,925
2,866
Do a Google search on scientific notation.
 
  • #6
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5
For everyone banging their head on the table after reading this: this is what's wrong with our science education. 'The right answer' is everything, understanding is nothing.
 
Last edited:
  • #7
adjacent
Gold Member
1,549
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right, just how do i round that off to the si units thing

and gneill, yea, pressure = force/area is what i meant, i know how to do these man, just need to know to get the answer to how it is in the actual book which is 2.613 x 104
Didn't you study standard form or Scientific form during maths class?
On your calculator,when you make scientific form as the mode,the answer becomes the standard/scientific form.
1000000 can be written as 1 x 10^6

For everyone banging their head on the table after reading this: this is what's wrong with our science education. 'The right answer' is everything, understanding is nothing.
You are right.But that applies more to subjects like Biology.Physics is all about understanding
 
Last edited:
  • #8
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
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What the heck are the units of the answer? That's just as important as the number.
 
  • #9
adjacent
Gold Member
1,549
63
What the heck are the units of the answer? That's just as important as the number.
Yes.Units are normally worth 1 mark.
 

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