Advertisements
Advertisements
Question
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
Advertisements
Solution
1 kgf = 10 N
∴ g = 10 ms-2
1) Thrust is
F = mg
= 7.5 kg × 10
= 75 N
2) Pressure is force per area.
∴ P = `"F"/"A"_"base"`
= `75/(12 xx 10^-2 xx 8 xx 10^-2)`
∴ P = 7812.5 Pa
RELATED QUESTIONS
What do you mean by buoyancy?
Relative density of a substance is expressed in g cm-3.
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
What is a density bottle? How is it used to find the density of a liquid?
A cork piece floats on water surface while an iron nail sinks in it. Explain the reason.
Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.
How does the liquid pressure on a diver change if:
the diver moves to the greater depth
The pressure inside a liquid of density p at a depth h is :
A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of centre of buoyancy B with respect to the centre of gravity G of the block.
Select the correct option:
When an object sinks in a liquid, its:
