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Undirectional - Formation of rain wind ...

Undirectional - Formation of rain wind
Ground fire - Flag forms
Surface fire - Flameless
Crown fire - Forest canopy

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Crown fire - Forest canopy
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After a forest fire, when above ground plant parts are killed ferns are often one first plants to appear ? Why ?

A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s^(–1) . If 20% of its initial energy is lost due to martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it ? Mass of mars = 6.4 ×x 10^(23) kg, radius of mars = 3395 km, G = 6.67 xx 10^(-11) N m^(2) Kg^(-2) .

Knowledge Check

  • Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first ?

    A
    the faster one
    B
    the slower one
    C
    depends on the mass
    D
    both will reach simultaneously

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    Hold a concave mirror in your hand (or place it in a stand). Direct Its reflecting surface towards the sun. Direct the light reflected by the mirror onto a sheet of paper held not very far from the mirror. Move the sheet of paper back and forth gradually until you find a bright, sharp spot of light on the paper. Position the mirror and the paper at the same location for few moments. What do you observe? Why does the paper catches fire?

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    A person holdinga rifle (mass of person and rifle together is 100kg) stands on a smooth surface and fires 10 shots horizontally, in5s. Each bullet has a mass of 10 g with a muzzle velocity of 800 ms^(-1).The final velocity acquired the person and the average force exerted on the person are:

    What is forest fire? What is its effects on environment?

    (a) Primary succession takes a very long time for the occurrence in any region. (b) Secondary succession takes less time. (c) Forest destroyed by fire is an example for primary succession, (d) The development of plant community in a barren area is primary succession.

    A rocket is fired vertically with a speed of 5 km s^(-1) from the earth’s surface. How far from the earth does the rocket go before returning to the earth ? Mass of the earth = 6.0 x× 10^(24) kg, mean radius of the earth = 6.4 xx 10^(6) m , G = 6.67 xx 10^(-11) " N "m^(2) kg^(-2) .

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