1.The stress on a wire supporting a load does not depend on the a. wire’s length
ID: 3309146 • Letter: 1
Question
1.The stress on a wire supporting a load does not depend on the
a. wire’s length c. mass of the load b. wire’s diameter d. acceleration of gravity
2.The maximum stress to which a solid can be subjected without being permanently deformed is known as its
a. ultimate stress b. elastic limit c. elasticity d. density
3.The ratio of the stress to the strain is
a. bulk modulus c. Young’s modulus b. shear modulus d. modulus of rigidity
2. Answer the following:
A. A three-legged stool one leg of aluminum, one of copper, and one of steel. The legs have the same dimensions. If the load on the stool is on its exact center, which leg is under the greatest stress?Which one is under the least stress? Why?
B.Two boys wish to break a string. Are they more likely to do this if each takes one end of the string and they pull against each other, or if they tie one end of the string to a tree and both pull on the free end? Why?
C.Why may a person break a thermos bottle by tapping lightly on the stopper?
D.What must be true of the cohesive forces in ductile and malleable materials?
Explanation / Answer
PART 1:
ANSWER 1:
Stress: Force per unit area of a material.
Area depends on the diameter of the rope. The force depends on the mass of the load multiplied by the acceleration due to gravity. So, the only thing remains and the answer is (a) Wire's Length.
ANSWER 2:
We call it yield strength but it has another name as the elastic limit. So the answer is (b) Elastic limit
ANSWER 3:
The ratio of the stress to the strain and the answer is (c) Young's Modulus.
PART 2:
A.
Stress is not a property of material but of the geometry and the load. So, the stress in all the three legs would be equal as they have the same dimensions. The strain on the other hand is the property of the material.
B.
The best way is to tie one end of the string to a tree and both pull on the free end because the tree can provide almost any force until it falls down. If they both try the other way the tension in the rope will come down to half.
For the other answers repost the question specifying the question to be answered(max 4 preferably).
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.