Helppppppp meeee plleeeassee
2 answers:
You might be interested in
Explanation:
Young' modulus is the ratio of normal stress to the longitudinal strain. Mathematically, it is given by :
Normal stress is given by force per unit area. Longitudinal strain is the change in length per unit original length.
The mathematical definition of Young's modulus is given by :
..........(1)
Where
is the change in length
F is the force
A is the area of cross section
So, the Young's modulus refers to the change in length of the object. Hence, the correct option is (b) "length".
Answer:
a
The tension in the string is
b
The new balance reading is
Explanation:
From the question we are told that
The mass of the beaker of water is
The diameter of the copper ball is
There are two forces acting on the copper ball
The first is the Buoyant force of the water pushing it up which is mathematically represented as
Where is the density of water which has value of
g is the acceleration due to gravity
is the volume of water displaced by the copper ball which is mathematically evaluated as
The radius r is
Substituting value
Substituting for F
The second force is the weight of the copper ball which is mathematically represented as
Now m is the mass which can be mathematically evaluated as
Where is the density of copper with value of
So
So the weight of copper is
Now the tension the string would be mathematically evaluated as
So
From this value we that the string is holding only 0.85 N of the copper weight thus (0.956 - 0.85 = 0.1065 N ) is being held by the balance
Now the mass equivalent of this weight is mathematically evaluated as
Converting to grams
So the new balance reading is