  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.
1 Hoarseness. 2  If acid reflux gets past the upper esophageal sphincter, it can enter the throat (pharynx) and even the voice box (larynx), causing hoarseness or sore throat. 3  Laryngitis. 4  Chronic dry cough, especially at night. 5  GERD is a common cause of unexplained coughing. GERD is a common cause of unexplained coughing. 2  It is not clear how cough is caused or aggravated by GERD. 3  Asthma. 4  Refluxed acid can worsen asthma by irritating the airways. 5  And asthma and the medications used to treat it can make GERD worse. 6  Feeling as if there is a lump in your throat.