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When the temperature is higher, molecules will speed up and bump into each other causing them to spread farther apart. Therefore, the density is less. This is the opposite when the temperature is cooler.
Explanation:
Given that,
Length of each rod, L = 15 m
Area of cross section of the rod, 
Young's modulus for steel, 
Total weight of two people, F = 1900 N
We need to find the stretching in the rod when the ride is at rest. The formula of Young's modulus of a material is given by :

Here,
is the stretching in the rod

So, the rod will stretched to 
Answer:
The value of torque on the rod is = 3.94 N - m
Explanation:
mass = 50 kg
Radius = 0.5 m
Moment of inertia ( I ) = 

I = 6.25 kg- 
Angular velocity
= 120
= 12.6 
Δ
= No. of rev × 2
Δ
= 20 × 2
Δ
= 126 rad
From work energy theorem
Work done is equal to change in kinetic energy.
-------- (1)
Where A & B represents the initial & final states.
Since
= 0



496 J
We know that
T Δ
Where
work done
T = torque applied on the rod
Δ
= Angular displacement of the rod.
496 = T × 126
T = 3.94 N - m
Therefore the value of torque on the rod is = 3.94 N - m
Answer:
What is the cloud model? It is the most recent model of the atom. Notice that instead of showing the paths of the orbit of the electrons it just shows a "cloud" around the nucleus. The cloud represents where any one electron could be at any time. This electron cloud model is based on quantum mechanics.