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Physics: Post your doubts here!

Faris

Faris

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Assalamualaikum...
Can anybody pls solve this question...

The movement of sea-water through turbines in a narrow harbour entrance is to be used to generate electricity. The harbour has vertical sides and encloses a surface area of 6.0 x 104 m2. During a 3-hour period around low tide, sluice gates are opened and the water level in the harbour falls by 5.0m.

(i) Calculate, for the 3-hour period, the gravitational potential energy lost by the water leaving the harbour. The density of sea-water is 1050 kg m. 3.

(ii) The generating system converts this potential energy to electrical energy with an efficiency of 40%. Calculate the mean electrical power generated.

(b) A small tidal power scheme and a large complex of coastal wind turbines can be built for approximately the same cost. The maximum electrical power output of each would be similar. Explain two advantages of

choosing the tidal scheme option.
 
Serial_Ripper

Serial_Ripper

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HELP PLEASE!!!
Can anyone upload any of these books?
1444112694
ref=pd_sim_sbs_b_2

or send the link??
 
princess Anu

princess Anu

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I know that but isn't it that distance is inversely proportional to force acting so why won't the distance of the Weight from pivot etc make any difference?
Physicist said:
there is equilibrium. so resultant force is always zero. upwards forces = downward forces
Click to expand...
 
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