Answer:
Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.
Explanation:
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I beileve the answer is B
Answer:
4.1%
Explanation:
Given that water specific heat c = 4186 J/kgC. If water is flowing with mass rate of 200kg/s and temperature is dropping from 200C to 25C. Then the thermal energy rate from the water should be
or 146510kW
Since the turbine is only able to extract 6000kW of power, then the thermal efficiency is:
or 4.1%
F=mxa
(25-2.6)=7 X a
22.4\7=a
a =3.2 metres per second squared
