Question

find the upward force in Newton when each of these is under water(density of 1g/cm3) a lump of iron of volume 2000cm3​

Answer 1

Upthrust = 19.6 N

Step-by-step explanation:

When an object is immersed under water, the upward force it experience is called an upthrust. An upthrust is a force which is applied on any object in a fluid which acts in an opposite direction to the direction of the weight of the object.

Upthrust = density of liquid x gravitational force x volume of object

i.e U = ρ x g x vol

Given: ρ = 1g/
`cm^(3)` (1000 kg/
`m^(3)`), volume = 2000 c
`m^(3)` (0.002
`m^(3)`) and g = 9.8 m/
`s^(2)`

So that;

U = 1000 x 9.8 x 0.002 (kg/
`m^(3)` x
`m^(3)` x m/
`s^(2)`)

= 19.6 Kg m/
`s^(2)`

U = 19.6 Newtons

The upthrust on the iron is 19.6 N.