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3 years ago

7

Which of these is a part of the biosphere? a. wind b. lakes c. bacteria d. glaciers

2 answers:

Aleks [24]3 years ago

4 0

B. lakes is a part of the biosphere
Biosphere is defined as "<span>the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms." and a lake is the only thing on the list that could be occupied by a living thing.</span>

Hatshy [7]3 years ago

3 0

The answer is bacteria. Living things are part of the biosphere and bacteria is the only living thing.

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A 0.473 kg ice puck, moving east with a speed of 2.76 m/s, has a head-on collision with a 0.819 kg puck initially at rest. Assum

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Answer:

The final speed of puck 1 is 0.739 m/s towards west and puck 2 is 2.02 m/s towards east .

Explanation:

Let us consider east as positive direction and west as negative direction .

Given

mass of puck 1 , $m_1= 0.473 kg$

mass of puck 2 , $m_2= 0.819 kg$

initial speed of puck 1 , $u_1=2.76\frac{m}{s}$

initial speed of puck 2 , $u_2=0.00\frac{m}{s}$

Final speed of puck 1 and puck 2 be $v_1\, and\, v_2$ respectively

Apply conservation of linear momentum

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=> $0.473\times 2.76+0.0=0.473\times v_1+0.819\times v_2$

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Since collision is perfectly elastic , coefficient restitution e=1

$u_2-u_1=v_1-v_2$

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