ernestinebell3514
30.08.2019 •
Physics
Assume a hydro power plant with 85% efficiency and 30m head. it is measured that 60 kg of water passes through the turbine in 1 s. what is the output electrical power of this power plant?
a) less than 1 kw
b) between 1 kw and 10 kw
c) more than 10 kw
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Ответ:
(M G H) = (1kg) (9.8 m/s²) x (30 m) = 294 joules
The potential energy lost by 60 kg of water pouring through is
(60 x 294) = 17,640 joules
The power output of the plant is
(17,640 joules/sec) x (85%) = 14,994 watts
= almost but not quite 15 kW.
(If you used 10 for gravity, it would come out to 15.3 kW)
Ответ:
V0=0
So v=at.
And v=14m/s, t=6.0s.
So a=v/t, a=14/6m/s^2
a=2.333333m/s^2