Answer:
The firefighter who holds the hose in the backward direction will experience greater force.
Explanation:
Lets take
mass flow rate = m
Inlet velocity = v₁
Exit velocity = v₂
When water leaves in the same direction ,then change in the linear momentum = m (v₂ - v₁)
And we know that change in the linear momentum is known as force.
F₁ =m (v₂ - v₁) ----------1
When water leaves in the opposite direction(U turn) ,then change in the linear momentum = m (v₂ +v₁)
F₂= m (v₂ +v₁) --------2
F₂ >F₁
There fore when water leaves in the U turn pipe will feel more force.
The firefighter who holds the hose in the backward direction will experience greater force.
