Mechanics> EXCELLENT PROBLEM SIR,PLEASE HELP ME IN I...

The water level in a 24 cm diameter tank is initially at a height of 10 cm. As a first grade science experiment, the students are asked to float a CD on the water. The CD has a diameter of 12 cm, a mass of 16 grams, and a density 1.2x that of water. CDs are highly hydrophobic and they float through surface tension even though they are denser than water

After they float the CD, one of the students experiments by adding 4 pennies totaling 8 grams to the CD.

What will be the new surface level of the water be, at points relatively far away from the CD? (3 cm is a reasonable distance)

sohan singh singh , 15 Years ago

Grade 12

2 Answers

Chetan Mandayam Nayakar

Let h be the height of water below and close to the CD, and H the height at far away points.

π(9²)h + πH(12²-9²) =π(12²)10

πρg(H-h)*6² = 24g

Solving the above two simultaneous equations, we get H= 10+(3/8π) = 10.12cm

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Last Activity: 15 Years ago

Vijay Luxmi Askiitiansexpert

Dear Sohan,

Let h be the height of water below and close to the CD, and H the height at far away points.

π(9²)h + πH(12²-9²) =π(12²)10

πρg(H-h)*6² = 24g

Solving the above two simultaneous equations, we get H= 10+(3/8π) = 10.12cm

Now Win exciting gifts by answering the questions on Discussion Forum.

Last Activity: 15 Years ago

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Mechanics> EXCELLENT PROBLEM SIR,PLEASE HELP ME IN I...

sohan singh singh , 15 Years ago

Chetan Mandayam Nayakar

Vijay Luxmi Askiitiansexpert

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