A vector is a quantity that has 2 independent properties:magnitude and direction.
Vectors can be graphically represented by directed line segments.
We can add vectors by joining them head to tail
Momentum = mass x velocity = 91x9 = 819 kg-m/s.
Answer:
The energy of the electron in a helium ion is 
Explanation:
Given that,
Charge = +1
Value of n = 4
Suppose 
We need to calculate the energy of the electron in a helium ion
Using formula of energy
Put the value into the formula
Hence, The energy of the electron in a helium ion is
Hi!
The correct answer is: C. It is the data value that appears the most often in the set.
<h3>
Explanation</h3>
The mode of a set of values is the number which is the most frequently appearing, or most repeating value in the range. The numbers that show one time each are
A - 16 , C - 25 , D - 3
While 13 appears three times with the dishes labelled
B , E and F
So, the value that appears the most times is 13, and hence 13 is taken as the mode of this data set
<h3>Hope this helps!</h3>
