Answer:
There are six kinds of forces that act on objects when they come into contact with one another: Normal force, applied force, frictional force, tension force, spring force and resisting force. These forces make objects change their motion or movement , the act of going from one place to another.
Answer:
For the first one c is the answer
For the second one c is also the answer
For the third one is b
Explanation:
I took that
I cannot see all the questions, what is 18,19 and 21? (:
Answer:

Explanation:
Given

Required
Determine the difference in the blood pressure from feet to top
This is calculated using Pascal's second law.
The second law is represented as:

Subtract P1 from both sides

Where



P2 - P1 = Blood Pressure Difference
So, the expression becomes:



Hence, the difference in blood pressure is approximately 
<h3><em>The body's main sources of energy are carbohydrate and fat. At times, protein can serve as an energy source in which the liver removes an amine group from the amino acid.</em></h3>