Speed of ball is 19.80 m/s .
<u>Explanation:</u>
We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:
We know that,
Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by , where m is mass , g is acceleration due to gravity & h is height !
Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by , where m is mass & v is the velocity of object !
By conservation of energy :
⇒
⇒
⇒
According to question , h=20 m i.e.
⇒
⇒
⇒
Hence , Speed of ball is 19.80 m/s .
Answer:
Consult not your fears but your hopes and your dreams. Think not about your frustrations, but about your unfulfilled potential. Concern yourself not with what you tried and failed in, but with what it is still possible for you to do.
Answer: water
The light reactions of noncyclic photophosphorylation takes place in the chloroplast.
The light energy is converted to chemical energy to produce both ATP and NADPH,
which act as energy-transfer molecules in the light-independent reactions of
the Calvin cycle. The addition of phosphate due to synthesizing of ATP by cells
results to photophosphorylation.
Moreover, <span>the electrons from water replenish chlorophyll molecules that
have given up electrons by photolysis. The two electrons from the water
molecule are kept in photosystem II, while the 2H+ and 1/2O2 are
left out for further use.</span>
.
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