Question

dimensional formula of physical quantities in. 1. mechanics , 2. Tharmodaynamics , 3. Electrodaynamics , 4. physical constant , 5. optics.


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Answer 1

Agriculture is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities. The history of agriculture began thousands of years ago.

Answer 2

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1. Classical mechanics is a model of the physics of forces acting upon bodies; includes sub-fields to describe the behaviors of solids, gases, and fluids. It is often referred to as "Newtonian mechanics" after Isaac Newton and his laws of motion. 
2. If an object is moving in a horizontal circle at constant speed, the centripetal force does not do work and cannot alter the total mechanical energy of the object. For this reason, the kinetic energy and therefore, the speed of the object will remain constant. 
3. The hot fuel particles reacted with water and caused a steam explosion, which lifted the 1,000-metric-ton cover off the top of the reactor, rupturing the rest of the 1,660 pressure tubes, causing a second explosion and exposing the reactor core to the environment.
4. Distractions can be external (such as noise) or internal (such as fatigue, rumination, or stress). Distractions may be caused by a number of factors, including the loss of interest in the primary activity, inability to pay attention due to various reasons, or intensity of the distractor.
5. The person holding that position has only one responsibility or whatever he does is considered as one concept, responsibility, but "responsibilities" is plural and the person has more than one responsibility.

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