  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 Rhinitis of pregnancy is a condition that can lead to coughing. 2  Many women experience congestion throughout their pregnancies. 3  The congestion can lead to irritation and coughing. 4  Elevated estrogen levels can cause mucous membranes that line the nose to swell, which increases blood flow to the area and causes swelling. dry cough may occur during a common cold. The virus can be an irritant that causes a coughing reaction and the problem may become worse at night. Many women experience cold-like symptoms during pregnancy, which can lead to productive and unproductive coughs.