A position vector expresses the position of an object from the origin of a coordinate system.
Position vector is basically a straight line which has one of its ends end fixed to a body and whereas, the other end is attached to a moving point which tells the position of that specific point relative to the body. As the point accelerates, the position vector will vary its length and the direction accordingly.
Water could be made
to boil at 105 degrees Celsius instead of 100 degrees Celsius by taking
the sample to a higher altitude. Pressure is directly proportional to
temperature. So when you bring water into higher altitude, you are increasing
the external pressure and therefore increase the boiling point.
Your problem here is incomplete. Luckily, I found a similar problem with Lewis structures of choices to choose the answer from (shown in the attached picture). We know that the bond of water is H-O-H. According to octet rule, oxygen must have 8 electrons surrounding it. The two bonds with H accounts for 4. So, the other 4 occur as non-bonding electrons. The partial negative charge goes to oxygen because it is more electronegative than hydrogen. <em>Therefore, the answer is B.</em>