Question
A small solid ball of density half that of water falls freely under gravity from a height of m and then enters into water. Upto what depth will the ball go? How much time will it take to come again to the water surface? Neglect air resistance, viscosity effects of water and energy loss due to collision at water surface. ()
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Question 2
An Indian Submarine is moving in "Arab Sager" with a constant velocity, detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially, the waves are getting reflected from a fixed land the reflected waves are coming back to the submarine. The frequency of reflected waves are detected by & submarine and found to be 10% greater than the sent waves.Now an enemy ship comes in front. due to which at type frequency of reflected waves detected by submarine becomes 21% greater than the sent waves.
The speed of the Indian submarine is :
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Question Text | A small solid ball of density half that of water falls freely under gravity from a height of m and then enters into water. Upto what depth will the ball go? How much time will it take to come again to the water surface? Neglect air resistance, viscosity effects of water and energy loss due to collision at water surface. () |