Question

Solve the following:
a. The mass of 1cubic meter of water is 1kg.Find out the density of water.

b. A box weighing 10kg with an area of 4square meter is placed on the table.What is the pressure that the box exerts on the table?

c. A force of 120N is needed to move a nut using a spanner of lengh 30m.What is the moment of force?​

Answer 1

i)

• Mass = m = 1 kg
• Volume = v = 1 m³

${\boxed{\sf{D=\dfrac{M}{V}}}}$

$\sf \longrightarrow D=\dfrac{1}{1}$

$\sf \longrightarrow D = 1\;kg\;m^3$

ii)

• Mass = m = 10 kg
• Area = a = 4 m

${\boxed{\sf P=\dfrac{F}{A}}}$

$\sf \longrightarrow P=\dfrac{10}{4}$

$\sf \longrightarrow P=2.5\; Pa$

iii)

• Force = f = 120 N
• Length = l = 30 m = 3000 cm

${\boxed{\sf M=FL}}$

$\sf\longrightarrow M=120\times 3000$

$\sf\longrightarrow M=360000\;NM$