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,


Potential energy is in short, stored energy
_ acceleration occurs when an object speeds up.
Answer
Positive
Answer:
Approximately
(assuming that the projectile was launched at angle of
above the horizon.)
Explanation:
Initial vertical component of velocity:
.
The question assumed that there is no drag on this projectile. Additionally, the altitude of this projectile just before landing
is the same as the altitude
at which this projectile was launched:
.
Hence, the initial vertical velocity of this projectile would be the exact opposite of the vertical velocity of this projectile right before landing. Since the initial vertical velocity is
(upwards,) the vertical velocity right before landing would be
(downwards.) The change in vertical velocity is:
.
Since there is no drag on this projectile, the vertical acceleration of this projectile would be
. In other words,
.
Hence, the time it takes to achieve a (vertical) velocity change of
would be:
.
Hence, this projectile would be in the air for approximately
.