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)

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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