Answer:
We choose PTFE
Explanation:
Attached are the modulus density and modulus strength chart.
Due to its young modulus, the density is near 0.5 GPa, as seen in the chart and support water gliding. The PTFE density is between 1 and 10 Mg / cubic meter (see module and chart of density), and the resistance is between 10 and 100 Mpa (see module and chart of strength). Therefore, the finest ploymer will be PTFE that meets the requirements.
Answer:
Impulse =14937.9 N
tangential force =14937.9 N
Explanation:
Given that
Mass of car m= 800 kg
initial velocity u=0
Final velocity v=390 km/hr
Final velocity v=108.3 m/s
So change in linear momentum P= m x v
P= 800 x 108.3
P=86640 kg.m/s
We know that impulse force F= P/t
So F= 86640/5.8 N
F=14937.9 N
Impulse force F= 14937.9 N
We know that
v=u + at
108.3 = 0 + a x 5.8
So tangential force F= m x a
F=18.66 x 800
F=14937.9 N
Answer:
Detailed solution is given in the attached diagram
<h3><u>The distance between the two stations is</u><u> </u><u>3</u><u>7</u><u>.</u><u>0</u><u>8</u><u> km</u></h3>
Explanation:
<h2>Given:</h2>
<h2>Required:</h2>
Distance from Station A to Station B
<h2>Equation:</h2>
<h2>Solution:</h2><h3>Distance when a = 0.4 m/s²</h3>
Solve for
Solve for
Solve for
<h3>Distance when a = 0 m/s²</h3>
Solve for
Solve for
Solve for
<h3>Distance when a = -0.8 m/s²</h3>
Solve for
Solve for
Solve for
<h3>Total Distance from Station A to Station B</h3>
<h2>Final Answer:</h2><h3><u>The distance between the two stations is </u><u>3</u><u>7</u><u>.</u><u>0</u><u>8</u><u> km</u></h3>
Answer:
h = 23.237 W/m2 K
Explanation:
given data:
flow rate = 1.08*10^6 gm/h = 0.3 kg/s
D = 4.5 cm = 0.045 m
L = 10^4 cm = 100 m
surface temperature = 370 K
Surface heat of vapor = 2190 J/kg.k
From energy conservation principle we have
heat transfer btwn surface and air = heat loss due to flow and temp. drop
where
heat transfer btwn surface and air is due to convection
WHERE
from both above equation we have
putting all value to get heat transefer coefficient
h = 23.237 W/m2 K