Answer:
0.799Btu/lbm
Explanation:
Data given
velocity, v= 200ft/s
Since the formula to define the the kinetic energy is
where v=velocity and the final answer expressed in Btu/lbm
we just substitute the value of the velocity into the equation and we arrive at
Now we convert to Btu/lbm
since
then
Hence the kinetic energy in is 0.799Btu/lbm
<span>Commutator
is the moving part of the electric motor and periodically reverses the current
direction between the rotor and the external circuit.One end of the coil is
attached to each half of the commutator.
Commutator are used so when electricity flows through the circuit, the
coil will rotate continually in the same direction.</span>
It can only be acheived by doung excercises frequently.
We do as follows:
energy = charge x voltage change .
Let q be the charge then E = q V
<span>and solving for q we have
q = E / V = -1.37e-5J / 2850V = -4.81x10-9 C
</span>
Hope this answers the question. Have a nice day.
