A Fire Hose Is Turned on the Door of a Burning

question 69

Multiple Choice

A fire hose is turned on the door of a burning building in order to knock the door down.This requires a force of 1000 N.If the hose delivers 40 kg of water per second,what is the minimum velocity of the stream needed to knock down the door,assuming the water doesn't bounce back?

• A)15 m/s
• B)20 m/s
• C)25 m/s
• D)30 m/s

---

Definitions:

Interleukin-1 Receptor

A type of protein that binds interleukin-1, playing a crucial role in mediating inflammatory responses.

IgA

An antibody essential to the immune function of mucosal surfaces.

Saliva and Tears

Bodily fluids produced by salivary and lacrimal glands, respectively, playing roles in digestion, oral health, and eye lubrication.

IgD

A class of antibodies that plays a role in the activation of immune cells and is found in small amounts in the blood.