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Explanation:
26. The astronomical unit is a unit of length, roughly the distance from Earth to the Sun and equal to about 150 million kilometres. The actual distance varies as Earth orbits the Sun, from a maximum to a minimum and back again once each year.
27. Measurement, the process of associating numbers with physical quantities and phenomena. ... Measurement is fundamental to the sciences; to engineering, construction, and other technical fields; and to almost all everyday activities.
28. The center of gravity is the average location of the weight of an object. We can completely describe the motion of any object through space in terms of the translation of the center of gravity of the object from one place to another, and the rotation of the object about its center of gravity if it is free to rotate.
29. Metalloids are elements which have properties intermediate between those of metals and non-metals. Examples are silicon, germanium etc.
30. Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. ... All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.
31. In some plants, the roots change their shape and get modified to absorb and transport water and minerals from the soil to different parts of the plant. They are also modified for support, food storage, and respiration. The root modifications perform two major functions- Physiological and Mechanical.
32. Hepatitis refers to an inflammatory condition of the liver. It's commonly caused by a viral infection, but there are other possible causes of hepatitis. These include autoimmune hepatitis and hepatitis that occurs as a secondary result of medications, drugs, toxins, and alcohol.
33. Physical quantities are classified into two types. ... These are length, mass, time, electric current, temperature, luminous intensity and amount of substance. Quantities that can be expressed in terms of fundamental quantities are called derived quantities. For example, area, volume, velocity, acceleration, force.
34. suitability, suitableness(noun) the quality of having the properties that are right for a specific purpose. "an important requirement is suitability for long trips"
35. An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
36. Properties of Nucleons. We use the word nucleon when we want to refer to either a proton or a neutron without making a distinction between them. Since they have about the same mass, protons and neutrons act as if they were identical particles that differ only in their electric charge.
37. Some examples of the reportable communicable diseases include Hepatitis A, B & C, influenza, measles, and salmonella and other food borne illnesses.