An empty office chair is at rest on a floor. consider the following forces: 1. a downward force of gravity. 2. an upward force exerted by the floor. 3. a net downward force exerted by the air. which of the forces is (are) acting on the office chair?

Explanation:

When a chair is at rest on the floor , the earth will exert a force of gravity  on it which is also known as its weight. This force acts on the chair in downward direction towards the centre of the earth.

The chair also experiences  another force called reaction force which is exerted by the floor on which it rest . This force acts on the chair in upward direction. This force is equal to the weight of the chair  in case chair is at rest or it is moving in uniform motion.

Due to these two equal and opposite  forces, acting on the chair, it remains at rest, as net force becomes zero.

A net downward force exerted by air , which is the reaction force of buoyant force acting on chair in upward direction acts on the floor on which chair rests . This force does not act on the chair.

Hence out of three forces given , only two forces act on the chair.

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me