Answer:
Less friction
Explanation:
Paolo's bike is too difficult to pedal because there is too much friction in the mechanisms of the bike. To reduce friction, Paolo must oil the chain. This will make the bike run much more smoothly and allow for easier pedalling.
Answer:
This is likely possible for a region whose matter density is higher than the normal average.
Explanation:
A galaxy is a collection of lumps in space which are clumped together and interact with each other. There are a lot of speculations on how galaxies were birthed. some believe its formed by a collection of massive gas, dust which eventually collapsed under their own gravitational pull. others says its formed by the combination of large lumps of matter which accumulated forming thee galaxies. The possibility of a galaxy forming is dependent on how massive the matter in the region of the universe is.
Answer:
638.8kW
Explanation:
The flow rate of the steam m = 22kg/s
The Pressure of the steam at the inlet of the turbine P1 = 1.6MPa
The temperature of the steam at the inlet of the turbine T1 = 350*C
Steam quality at the exit of the turbine x2 = 1.0
The temperature of the steam at the exit of the turbine T2 = 30*C
Power produced = 12,350kW
Assuming the turbine is running on a steady state, hence we neglect the effect of kinetic and potential energy we get:
If you refer to the superheated steam table for the specific enthalpy at a pressure of 1.6MPa and temperature of 350*C, we get
h1 = 3,146kJ/kg
Refer to the steam table for saturated gas at temperature 30*C to get the specific enthalpy value h2 = 2,556.81kJ/kg
The heat that comes out from the turbine can be defined from the balance of energy in the system, and is represented as
Ein - Eout = change in system Energy = 0
Thus Ein = Eout
mh1 = mh2 + Wout + Qout
Qout = m(hi-h2) - Wout
Qout = 22 x (3146-255.6) - 12350
Qout = 638.8kW
