A smith needs to melt 0.0500 kg of gold at 21.0°C. How much heat must be added? (Remember, she has to heat it to the melting poi
nt first.) (Unit=J)
1 answer:
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Answer:
The convection coefficient is
Solution:
Mass flow rate,
Inner diameter of the tube, d = 0.014 m
Fluid density,
Specific Heat, C = 3845 J/K
Thermal Conductivity, K = 0.74
Prandtl Number,
Heat flux,
Viscosity,
Now,
To calculate the convection heat coefficient, h:
Determine the cross sectional area of the circular tube:
Determine the velocity of the fluid inside the tube by mass flow rate:
v = 2.624 m/s
Determine the Reynold's Number, :
Thus it is clear that > 10,000 hence flow is turbulent.
Now,
Determine the Nusselt Number:
Also,
where
h = convection coefficient
Now,
To solve this problem it is necessary to apply the concepts given in the kinematic equations of movement description.
From the perspective of angular movement, we find the relationship with the tangential movement of velocity through
Where,
Angular velocity
v = Lineal Velocity
R = Radius
At the same time we know that the acceleration is given as the change of speed in a fraction of the time, that is
Where
Angular acceleration
Angular velocity
t = Time
Our values are
Replacing at the previous equation we have that the angular velocity is
Therefore the angular speed of a point on the outer edge of the tires is 66.67rad/s
At the same time the angular acceleration would be
Therefore the angular acceleration of a point on the outer edge of the tires is