Instantaneous Acceleration Sample Problem

1. The fastest measured pitched baseball left the pitcher’s hand at a speed of 45.0 m/s. If the pitcher was in contact with the ball over a distance of 1.50 m and produced constant acceleration, (a) what acceleration did he give the ball, and (b) how much time did it take him to pitch it?

Instantaneous Velocity Sample Problem

1. A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by  (a) x(t)=bt^2-ct^3, where b=2.40m/s^2 and c=0.120m/s^3.   Calculate the average velocity of the car for the time interval to (b) Calculate the instantaneous velocity of the car at and (c) How long after starting from rest is the car again at rest?
Answer:

Unit Prefixes

Here are some examples of the use of prefixes:

• 70 000 m can be written as 70 km (kilometre)

• 0, 001 g is the same as 1 × 10^−3 g and can be written as 1 mg (milligram)

• 2, 6 × 10^6 N can be written as 2, 6 MN (meganewton)

Science and its branches

Science (from the Latin scientia, meaning “knowledge”) - is an organized body of knowledge about the natural universe and the processes by which that knowledge is acquired and tested.

1. Social Sciences - deal with human society and individual relationships

1. Natural Sciences - investigate the natural universe.

• Biological Science (also called "Life Science") - the study of living matter
• Physical Science - the study of nonliving matter.

5 Major Divisions of Physical Science

• Physics, the most fundamental of the divisions, is concerned with the basic principles and concepts of matter and energy.
• Chemistry deals with the composition, structure, and reactions of matter.
• Astronomy is the study of the universe, which is the totality of all matter, energy, space, and time.
• Meteorology is the study of the atmosphere, from the surface of the Earth to where it
• ends in outer space.
• Geology is the science of the planet Earth—its composition, structure, processes, and history.