Answer:
222.5 Gpa
Explanation:
From definition of engineering stress, 
where F is applied force and A is original area
Also, engineering strain,
where l is original area and
is elongation
We also know that Hooke's law states that 
Since A=20 mm* 20 mm= 0.02 m*0.02 m
F= 89000 N
l= 100 mm= 0.1 m

By substitution we obtain

Answer:
Two stroke cycle Four stroke cycle
1.Have on power stroke in one revolution. 1.have one power
stroke in two revolution
2.Complete the cycle in 2 stroke 2.Complete the cycle in 4 stroke
3.It have ports 3.It have vales
4.Greater requirement of cooling 4.Lesser requirement of cooling
5.Less thermal efficiency 5.High thermal efficiency
6.Less volumetric efficiency 6.High volumetric efficiency
7.Size of flywheel is less. 7.Size of flywheel is more.
Answer:
Phuong works on a research project and creates a report for her boss.