Answer:
All nonmetallic elements are generally poor conductors of heat and electricity. There are only 17 nonmetallic elements, while more than 75 percent of the known elements are either pure metals or metalloids, which are better conductors of heat and electricity to a varying degree.
Explanation:
Given:
max displacement, A = 3.2 m
f= 50 Hz
at t = 0, displacement, d = 150 cm = 1.5 m
Solution:
Displacement in the general form is represented by:
d = Asin(ωt ± α)
d = 3.2sin(2πft ± α)
d = 3.2sin(100πt ± α)
where,
A = 3.2 m,
ω = 2πf = 100π
Now,
at t = 0,
1.5 = 3.2sin(100π(0) ± α )
1.5 = 3.2sinα
sin α =
= 0.4687
α =
= 27.95° = 0.488 radian
Now, we can express displacement in the form of 'Asin(wt + α)' as:
d = 3.2sin(100πt ± 0.488 )
Answer:
an equivalent weight or force : counterbalance.
Answer:
1) 75Mpa
2) 1.125 MPa
Explanation:
given data:
gauge length = 4 mm
displacement 
a) structural steel
Young modulus for steel is 
we know that


= 75Mpa
b) PMMA
Young's modulus 

stress = 1.125 MPa
The heat transfer which is in steady state, the heat transfer rate to the wall is equal to the wall.
<u>Explanation:</u>
- The convection transfer of heat to the wall is

- Here,
is the temperature of solid surface,
is the temperature of moving fluid stream which is adjacent of solid surface, h is the heat transfer coefficient. - The coefficient of convection heat transfers outer surface contains 3 times to the inner surface which experience smaller drop of temperature for 3 times that compares to inner surface.
- Hence, the temperatures outer surface get close to the surroundings of air temperature.