Question

Identify the components present in the material based on the following results or

conclusions.

(a) Cut the raw potato and apply two to three drops on it - shows blue black

colour.

(b) Wrap the ground nut seed in paper and crush it carefully, oily patch can be​

Answer 1

Answer:

Given:

The length (h) of the hollow metallic cylinder is 77cm

The inner diameter = 4 cm

The inner radius (r) = 4/2 = 2 cm

Also, thickness is 0.2 cm

So, outer radius (R) = inner radius + thickness

R = 2 + 0.2 = 2.2 cm

Now,

To find:

The Total Surface Area of the hollow cylinder

The formula to find the TSA of the hollow cylinder is

= 2π (R + r)(h + R - r) unit sq,

[In which, 'R' is the outer radius, 'r' is the inner radius and 'h' is the height(i.e. length) of the hollow cylinder]

Now putting the given values,

\bf TSA = 2*\frac{22}{7}(2.2+2)(77+2.2-2)TSA=2∗722(2.2+2)(77+2.2−2)

\bf TSA = 2*\frac{22}{7}(4.2)(79.2-2)TSA=2∗722(4.2)(79.2−2)

\bf TSA = 2*\frac{22}{7}(4.2)(77.2)TSA=2∗722(4.2)(77.2)

\bf TSA = \frac{14266.56}{7}TSA=714266.56

TSA of the hollow metallic cylinder = 2038.08 cm sq.

MORE INFORMATION:

The total surface area of the hollow cylinder

= 2πRh + 2πrh + 2π(R² - r²)

= 2πh(R+h) + 2π(R + r)(R - r)

= 2π(R + r)(h + R - r)