मेट्रो रेल के लाभ और हानि के बारे में अपने विचार प्रकट करें​

Answer:

Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel the knot is commonly used.

SI unit of speed is m/s or [tex]\frac{m}{s}[/tex].Other units of speed is km/h or [tex]\frac{km}{h}[/tex].

Speed can be defined as distance travelled  by an object or a body per unit time.

• Speed can be calculated by :

• speed(s) = distance(d)/time(t).

As we know-

• Distance is measured in meters(m) or kilometers(km).

• Time is measured in seconds(s) or hours(h).

• SI unit of speed is given in terms of basic units of distance and time.

• While calculating speed we should be careful that if distance is given in meters, then time should also be in seconds not hours. If it is given in hours we should first convert it into seconds .
• SI stands for International System Of Units used universally as a standard for measurement.

impersonal communication is the opposite of personal communication. a personal conversation is worth someone who you know intimately and the conservation has a deeper context while impersonal conservation is with someone who you have just met and the conservation is superficial

Answer: Here You go

Explanation: A personal conversation is with someone who you know intimately and the conversation has a deeper context, while impersonal conversation is with someone who you’ve just met and the conversation is superficial.

Both Impersonal and Personal communication simply describe our level of interaction with the opposite person. The way we interact and the level of acquaintance with the opposite party defines if the type of communication – if it is personal of impersonal.

Personal communication is the type of interaction that you might have with a person that you are fairly acquainted with such as a friend or a colleague or even a relative. These types of conversations are more intimate and include feelings as well a broader context. You know this person and have spent a significant amount of time with them as well you know a bit about their background.

Amedeo Avogadro (1776 - 1856)-is best known for his hypothesis that equal volumes of different gases contain an equal number of molecules, provided they are at the same temperature and pressure.

Jons Jacob Berzelius (1779 - 1848)-is credited with discovering the chemical elements cerium and selenium and with being the first to isolate silicon and thorium. Berzelius discovered cerium in 1803 and selenium in 1817.

Robert Boyle (1627 - 1691)- He is best known for Boyle's law, which describes the inversely proportional relationship between the absolute pressure and volume of a gas, if the temperature is kept constant within a closed system. Among his works, The Sceptical Chymist is seen as a cornerstone book in the field of chemistry.

Marie Curie (1867-1934)- Marie Sklodowska Curie (1867–1934) was the first person ever to receive two Nobel Prizes: the first in 1903 in physics, shared with Pierre Curie (her husband) and Henri Becquerel for the discovery of the phenomenon of radioactivity

John Dalton (1766 - 1844)-

Dalton was a very important chemist that came up with a law about partial pressures. He developed a table of atomic weights for atoms and proposed his atomic theory. John Dalton's Atomic Theory stated that all matter composed of variety small particle atoms, which provides unique characteristics and weight.

Answer:

Name of Scientists who contributed in chemistry: Dmitri Mendeleev, Marie curie, Robert Boyle, Prafulla Chandra Ray, Linus Pauling, Ernest Rutherford, etc.

Explanation:

• He was the Russian chemist.
• He is known for contributing in forming of periodic law and using in putting elements in periodic table.
• He put periodic table's elements in the groups based on their chemical and physical properties.
• Due to this, he could predict the elements and their properties which were yet to be discovered.
• He predicted three elements which were yet to discovered, i.e., Eka-Aluminum (discovered element-Gallium), Eka-boron (discovered element-Scandium) and Eka-silicon (discovered element-Germanium).

• Marie curie discovered metallic elements Radium and Polonium.
• She Isolated pure state of metallic Radium for the first time.
• She carried out the first research on cancer tumors with radiation therapy.
• She won Nobel prize for her contribution in chemistry as well as physics.
• She is the only person who won Nobel prize in both physics and chemistry.

• Boyle is known as a founder of Modern chemistry
• Robert Boyle Discovered the Boyle's law of gas which is as below:

"At constant temperature, the absolute pressure is inversely proportional to the volume of a fixed amount of gas."

• He also developed the methods to determine purity of compounds and chemicals.

• 'Antoine Lavoisier' is known as 'Father of Chemistry'.
• He discovered that mass is conserved in a chemical reaction.
• He proved the law of conversion of mass.
• He gave the oxygen theory of combustion.

• Prafulla Chandra Roy was Bengali-Indian chemist.

• He is known as Father of Chemistry of India.
• He discovered Mercurous nitrite chemical compound.
• He was the founder of India's first pharmaceutical company: 'Bengal Chemicals and Pharmaceuticals'.

#SPJ2

she went to boston to meet someone and get ideas for the novel