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CBSE Class 9 Answered

A marble is dropped into a frictionless U tube. If the tube is semi circular with  mean radius 5 cm and mass of the ball 2 gram, then find its velocity at the bottom of the tube.
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Asked by ayan1.chatterjee | 13 Jan, 2021, 08:47: AM
answered-by-expert Expert Answer
Kinetic energy of marble is determined using conservation of energy .
 
Hence we equate the initial potential energy to kinetic energy of marble at bottom as given below.
 
( m g h ) = (1/2) m v2 ........................(1)
 
where m is mass of marble, g is acceleration due to gravity , h is vertical height of marble
from bottom of semi-circular tube and v is speed of marble at bottom of semi-circular tube .
 
h = radius of  semi-circular tube = 5 cm
 
Hence from eqn.(1) , we get ,  v = { 2 g h }1/2 = { 2 × 9.8 × 0.05 }1/2 ≈ 1 m/s
Answered by Thiyagarajan K | 13 Jan, 2021, 09:35: AM

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