Question: Assume that a drop of water is spherical and its diameter is one-tenth of 1 cm. A conical glass has a height equal to the diameter of its rim. If 32000 drops of water fill the glass completely, then the height of the glass (in cm) is
Options:
A) 1
B) 8
C) 3
D) 4
Show Answer
Answer:
Correct Answer: B
Solution:
- Let the radius of rim of the glass be r,
Height of glass = 2r
According to the question,
$ 32000\times \frac{4}{3}\pi \times \frac{1}{10}\times \frac{1}{10}\times \frac{1}{10}=\frac{1}{3}\pi \times r^{2}\times 2r $
$ \Rightarrow $ $ \frac{32000\times 4}{1000}=2r^{3} $
$ \Rightarrow $ $ r^{3}=64 $
$ \Rightarrow $ $ r=4 $
$ \therefore $ Height of glass = 2r = 8 cm