  A scalar has only magnitude. A vector has magnitude and direction.   Acceleration is a vector because it has magnitude and direction. That's why an o â¦ bject can be said to be accelerating if it has a circular rotation and a constant speed; even though it's speed isn't changing, it's direction constantly is. vector has magnitude and direction.   Acceleration is a vector because it has magnitude and direction. That's why an o â¦ bject can be said to be accelerating if it has a circular rotation and a constant speed; even though it's speed isn't changing, it's direction constantly is.
Chronic dry coughs are usually caused by irritation from cigarette smoke, environmental irritants, allergies, postnasal drip, or asthma. Several chronic lung diseases also cause a dry, hacking cough. Some people cough out of habit for no clear reason. Gastric reflux may also cause a chronic dry cough. Usually you will also have other symptoms, such as heartburn, burning in the throat, or increased saliva.
A cough is a natural response by the body or the respiratory system of the body to expel the irritant substance that is obstructing the air passage, and interferes in breathing mechanism. While cough is just a symptom the real cause for it is an underlying lung disease, or irritation of the respiratory tract.his helps him in diagnosing the causes for dry cough. Following are most common causes for dry cough. 1  Upper Respiratory Tract Infection: dry hacking cough is common symptom in later stage of common cold. 2  The post nasal drip irritates the larynx which results in dry coughing.