Natural Resources: Anything in the environment ‘which can be used’ is called ‘natural resource’. Natural resources include total natural environment that support human life and contribute to the production of necessities and comforts to mankind. So natural resources are the components of atmosphere, hydrosphere and lithosphere. On the basis of abundance and availability, the natural resources are of two types: (a) Inexhaustible (b) Exhaustible. (a) Inexhaustible. These are in plenty and cannot be exhausted by man’s consumption e.g., air, sand, clay etc, affected by over-population of mankind. (b) Exhaustible. These are limited and can get exhausted over a period of time. i.e., coal, petroleum etc. Management of Natural Resources A system of controlling the use of natural resources in such a way as to avoid their wastage and to use them in the most effective way is called management of natural resources. Why do we Need to Manage
1) A bullet blasts from the barrel of a gun upward in the vertical direction with an initial speed of 700 m/s. Find the maximum altitude reached by this bullet and the time needed to reach it.
ReplyDeleteInitial speed u = 700 m/s Final speed v =0m/s (at the maximum altitude) , a = -10m/s2
t = ( v-u)/0 =( 0 – 700)/-10 = 70m/s
v2 = u2 + 2as
v2 - u2)/ 2a =s
0 – (700)2 /2x-10
= - 490000/-20 = 24500m
2) A mouse is dropped from an eagle's claws starting at an altitude of 150 meters. What distance does it fall in the third second after it is dropped?
S = ut + ½ at2
0x3 + ½ x 10 x3x3
= 45m
http://physicsadda.blogspot.in/