Answer:
Both rod have the same tensile stress
Explanation:
Given information,
The weight first rod, 
= 1000 N
The length of first rod, 
= 2.0 m
The weight second rod, 
= 500 N
The length of second rod, 
= 1.0 m
The equation of tensile stress, σ = 
where
σ = tensile stress (N/
or Pa)
F = Force (N)
A = Area (N/ or Pa)
so
σ1 = 
, A = 2πl
= 
= 
N/
now calculate σ2
σ2 = 
= 
= N/
σ1/σ2 = /
σ1/σ2 = 1
σ1 = σ2
Hence, the tensile stress of first and second rod are the same.
Inertia is that quantity which depends solely upon mass. The more mass, the more inertia. Momentum is another quantity in Physics which depends on both mass and speed.
Explanation:
P.E=MGH
Where m is mass
Where G is Acceleration Due to Gravity
Where h is Height
So the parameters are M = 20kg
G = 9.8m/s
H = 0.5meters
P.E= 20x9.8x0.5
=98J.
So Ans. is A= 98J
Q1=Q2
m1c1(t-t1)=m2c2(t2-t)
67.9kg * c1* (38.7°C-37.1°C)=50.2kg * 4186 J/kg°C * (40.5°C-38.7°C)
67.9kg* c1 * 1.6°C = 50.2kg * 4186 J/kg°C * 1.8°C
108.64 kg°C * c1 = 378246.96 J
c1 = 378246.96J /108.64kg°C
c1=3481.65 J/kg°C
