# 1.1 Physics: an introduction  (Page 2/16)

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Physics aims to describe the function of everything around us, from the movement of tiny charged particles to the motion of people, cars, and spaceships. In fact, almost everything around you can be described quite accurately by the laws of physics. Consider a smart phone ( [link] ). Physics describes how electricity interacts with the various circuits inside the device. This knowledge helps engineers select the appropriate materials and circuit layout when building the smart phone. Next, consider a GPS system. Physics describes the relationship between the speed of an object, the distance over which it travels, and the time it takes to travel that distance. When you use a GPS device in a vehicle, it utilizes these physics equations to determine the travel time from one location to another.

## Applications of physics

You need not be a scientist to use physics. On the contrary, knowledge of physics is useful in everyday situations as well as in nonscientific professions. It can help you understand how microwave ovens work, why metals should not be put into them, and why they might affect pacemakers. (See [link] and [link] .) Physics allows you to understand the hazards of radiation and rationally evaluate these hazards more easily. Physics also explains the reason why a black car radiator helps remove heat in a car engine, and it explains why a white roof helps keep the inside of a house cool. Similarly, the operation of a car’s ignition system as well as the transmission of electrical signals through our body’s nervous system are much easier to understand when you think about them in terms of basic physics.

Physics is the foundation of many important disciplines and contributes directly to others. Chemistry, for example—since it deals with the interactions of atoms and molecules—is rooted in atomic and molecular physics. Most branches of engineering are applied physics. In architecture, physics is at the heart of structural stability, and is involved in the acoustics, heating, lighting, and cooling of buildings. Parts of geology rely heavily on physics, such as radioactive dating of rocks, earthquake analysis, and heat transfer in the Earth. Some disciplines, such as biophysics and geophysics, are hybrids of physics and other disciplines.

Physics has many applications in the biological sciences. On the microscopic level, it helps describe the properties of cell walls and cell membranes ( [link] and [link] ). On the macroscopic level, it can explain the heat, work, and power associated with the human body. Physics is involved in medical diagnostics, such as x-rays, magnetic resonance imaging (MRI), and ultrasonic blood flow measurements. Medical therapy sometimes directly involves physics; for example, cancer radiotherapy uses ionizing radiation. Physics can also explain sensory phenomena, such as how musical instruments make sound, how the eye detects color, and how lasers can transmit information.

Write short notes of the following 1.Laws 2.Theories
what is the meaning of evolved
To advance or to change from one level to another in the evolution chain
Alexander
Explain why a building made of bricks has smaller entropy than the same bricks in a disorganized pile. Do this by considering the number of ways that each could be formed (the number of microstates in each macrostate).
Omo physics hard ooo 😂😭😭😭
yeah but just need patient
Musbahu
The closeness of a measurement to the accepted value for a specific physical quantity is known as what ?
what's the procedure for solving exercise 9.
If you dive into water, you reach greater depths than if you do a belly flop. Explain this difference in depth using the concept of conservation of energy. Explain this difference in depth
A mass of 10kg move with a volocity of 4mß.find it's kinetic energy
80m/s²
Angel
KE=1/2mv²
Angel
m= 10
Angel
v=4
Angel
Happy to help
Angel
hi
Dike
What is the unit of force in F.P.S system
f=ma, f=m/s2
MD
lb-ft/s^2
Mary
what is an F.P.S system
Angel
please someone should send his or her number o. this platform
Pelumi
what is the unit for force
newtons
Angel
hello
Pelumi
Newton or kg. m/sec^2
Hiba
v=sin(att/s) Prove please as dimension consistent or not
v=sin(att/s) Prove please as dimension consistent or not
Hashim
what is physics
what is physic and what are its branches
= Kinematics = Quantum Physics = Dynamics = Statistics = Linear algebra = Calculus (Pre - Calculus, Calculus I Calculus II Calculus III Calculus IV) =Astrophysics And many more...... .....
puvananathan
what is andromeda
what is the milky way
What's the difference between deceleration and negative acceleration?