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Meghna Thapar 5 years, 7 months ago
The momentum and the kinetic energy of a moving body are the body’s properties which is very much related to velocity.
Momentum is the product of the mass of the body and its velocity. It is a vector quantity. Its unit of measure in SI is kg * m/s.
Kinetic energy is the product of one-half of the mass of the body and the square of its velocity or speed. It is a scalar quantity. Its SI unit is kg * m^2/s^2. This unit is usually expressed in newton * meter or joule.
KE = 1/2 * m * v^2 and p = mv. We can manipulate the KE formula to show where momentum is in it.
KE = 1/2 * m * v^2
KE = 1/2 * m * v * v
KE = (m * v) * (1/2 * v)
KE = p * (1/2 v)
In words we can say that the kinetic energy of a body is equal to the product of its momentum and one-half of its velocity.
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Meghna Thapar 5 years, 7 months ago
Important viral diseases of human beings are:
(i) Influenza – Influenza is commonly called flu. It is caused by an influenza virus (Myxovirus influenza). There exist three types of influenza viruses – A, B and C. A and B types of influenza viruses are important because these are responsible for causing of disease epidemics throughout the world. The inhaled virus attacks the epithelial cells in the mucous membrane of nose, throat and upper respiratory tract. Influenza is spread mainly from person to person contact and by droplet infection via sneezing, coughing and talking.
(ii) Jaundice – Jaundice or hepatitis is the disease of liver. Since liver is a very important organ in the body, so its inflammation due to jaundice affects digestion adversely. Jaundice is caused by viral infection. The types of hepatitis are: Hepatitis A, Hepatitis B, Hepatitis C, Hepatitis D, Hepatitis E or Hepatitis G. Except for type B which is a DNA virus, all the other are RNA viruses. Hepatitis is spread mostly by food and water contaminated with hepatitis virus.
(iii) AIDS - AIDS stands for Acquired Immuno Deficiency Syndrome. It is a fatal disease. The disease of AIDS is caused by retrovirus (a RNA virus) known as Human Immunodeficiency Virus (HIV). AIDS virus attacks white blood cells (WBCs) or lymphocytes of human beings and weakens the human body’s immunity or self-defence mechanism. AIDS becomes prone to many other infections or diseases.
(iv) Polio - Poliomyelitis or polio is a disease of the nervous system caused by one of the smallest known virus, called polio virus. The virus enters the body through the food and water and reaches the intestine and from there it enters the CNS or central nervous system via blood stream and lymphatic systems. Children between the age of 6 months to 3 years are most prone to polio infection. Polio is transmitted among children by the faeco – oral route and through the direct contact, dirty hands, contaminated food or milk and flies.
Posted by Nitish Yadav 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
A laser light stays focused and does not spread out much (like a flashlight would), laser beams can travel very long distances. They can also concentrate a lot of energy on a very small area. Red light has longer wavelength so we use red torch in laser light.
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Organ Specific Manifestation- These are the diseases caused in the same organ or organ system as the point of entry of the microbe. E.g. Tuberculosis which enters through the nose and affects the lungs. (Both are organs of the respiratory system)
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Vedansh Tomar 5 years, 7 months ago
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