How to Calculate Pressure on a Table Due to a Block of Mass 4 kg?

[tehmatriks]

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

 

[gneill]

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?

 

[Doc Al]

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)

 

[tehmatriks]

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

 

[gneill]

Do a Google search on scientific notation.

 

[Doug1943]

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.

 

[adjacent]

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

 

[SteamKing]

What the heck are the units of the answer? That's just as important as the number.

 

[adjacent]

What the heck are the units of the answer? That's just as important as the number.

Yes.Units are normally worth 1 mark.