fourth grade science


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The Fundamental Unit of Life
All living organisms, whether plants or animals, are made up of microscopic units called cells. The cell occupies the same central position in biology as the atom in the physical sciences..
Importance of Classification
By making a comparative study and assorting the similarities and differences amongst the various varieties of species, organisms can be classified into groups or sets. Taxonomy is a regular branch of science that is involved with the purpose of arranging or grouping organism..
Importance of Classification
Importance of Classification - By making a comparative study and assorting the similarities and differences amongst the various varieties of species, organisms can be classified into groups or sets. Taxonomy is a regular branch of science that is involved with the purpose of arranging or ..
To show that weight of a body on moon is 1/6th its weight on Earth
But we know that M e =100 M m and R e = 4 R m . Ear..
Example:1
Natural chlorine consists of two isotopes: Calculate the average atomic mass of chlorin..
If one joule of work is done in one second by any agent then its power is said to be one watt.
Kilowatt and megawatt are higher units of power. Another unit of power is horse power 1 horse power = 746 wat..
Solution:
Calcium carbonate = CaCO 3 Ca = 40, C = 12, O = 16GMM = 1 x 40 + 1 x 12 + 3 x 16= 40 + 12 + 48 = 100..
Solution:
Mass of the body (m) = 2 kg Height (h) = 25 m Potential energy of the body = mgh 02. A bag of rice weighs 75 kg. To what height is it raised if the work done in lifting it is 4900 ..
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