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A golf ball has diameter equal to 4.1 cm...

A golf ball has diameter equal to 4.1 cm. Its surface has 150 dimples each of radius 2 mm. Calculate total surface area which is exposed to the surroundings. (Assume that the dimples are all hemispherical) `[pi = (22)/(7)]`

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Knowledge Check

  • The diameter of a cone is 7 cm and its slant height is 16.5 cm. Then, its total surface area is ……… cm^(2)

    A
    110
    B
    220
    C
    105
    D
    154

  • Total surface area of a hemisphere with radius 7 cm is ……… cm^(2) .

    A
    231
    B
    115.5
    C
    462
    D
    154

  • The eye can be regarded as a single refracting surface. The radius of curvature of this surfac is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 an 1.34. Calculate the distance from the refracting surface at which a parallel beam of light wil come to focus.

    A
    4.0 cm
    B
    1 cm
    C
    3.1 cm
    D
    2 cm

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    Find the volume and surface area of a sphere of radius 2.1 cm (pi = (22)/(7))

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