(Rachel, an engineering student, was asked to make a model shaped like a cylinder with two cones attached at its two ends by using a thin aluminium sheet. The diameter of the
model is 'em and its length is 12 cm. If each cone has a height of 2 cm. find the volume
of air contained in the model that Rachel made. (Assume the outer and inner dimensions
of the model to be nearly the same.)​

For the given statement first draw a diagram,

In this diagram, we can observe that

Height (h1) of each conical part =2 cm

Height (h2) of cylindrical part 12−2−2=8 cm

Radius (r) of cylindrical part = Radius of conical part = 23 cm

Volume of air present in the model = Volume of cylinder + 2× Volume of a cone 

=πr2h2+2×πr2h1

=π(23)2×8+2×31π(23)2(2)

=π×49×8+32π×49×2

Step-by-step explanation:

Rachel, an engineering student, was asked to make a model shaped like a cylinder with two cones attached at its two ends by using a thin aluminium sheet. The diameter of the model is 3 cm and its length is 12 cm. If each cone has a height of 2 cm, find the volume of air contained in the model that Rachel made. (Assume the outer and inner dimensions of the model to be nearly the same.)

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

£56

step-by-step explanation: