Density Desktop
Density Desktop
I need some physics help por favor?
A physics book has a height of 25.2 cm, a width of 20.6 cm, and a thickness of 2.80 cm.
(a) What is the density of the physics book if it weighs 21 N?
kg/m3
(b) Find the pressure that the physics book exerts on a desktop when the book lies face up.
Pa
(c) Find the pressure that the physics book exerts on the surface of a desktop when the book is balanced on its spine.
Pa
I already know that the answer to a) is 1473.87 kg/m^3 but i dont know b & c.
the pressure is force per unit area
we all know the force is the weight of the physics book
the area of contact depends on how you place the book on the table
when the face is up , we can assume that the face with dimension 25.2 cm and 20.6 cm lie on the table
so the pressure exerted is 21 Newton /(0.252 * 0.206) = 404.53 N / m^2 or Pa
when its on its spine the pressure is 21 / ( .206 * .028) = 3640.78 Pa
so it depends on what surface is contact with the table
thats why when you stand on your bed, there is more pressure and you can deform it more or break it and not when you sleep on it
all the best
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