Asolid steel cylinder is standing (on one of its ends) vertically on the floor. the length of the cylinder is 4.0 m and its radius is 67 cm. when an object is placed on top of the cylinder, the cylinder compresses by an amount of 5.1 10-7 m. what is the weight of the object?

W=35955 N

Explanation:

In an elastic material like steel when deformation takes place then the stress ( σ ) produced in the material is directly proportional to the strain ( ∈

therefore young  modulus=stress/strain

y=σ/∈

y

f=external force

A is the cross-sectional area

L is the original length

Δ L  is the elongation

young modulus of steel 200 Gpa

200*10^9=f/1.41/(5.1*10^-7/4)

f=200*10^9*1.41*(5.1*10^-7/4)

f=35955 N

which is equal to the weight of the body

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide