CBSE Class 10 Answered
A stone is dropped into a well and the sound of the splash is heard after 25/8 seconds later. If the velocity of sound in the air is 352.8 m/s,find the depth of the well.(g = 9.8 m/s^2)
Asked by acv27joy | 12 May, 2018, 07:35: PM
Expert Answer
Let S is depth of well and the dropped stone takes t1 seconds to reach the water surface. The we have
S = (1/2)×9.8×t12 = 4.9×t12 ....................(1)
let t2 be the time taken for the sound to reach observer. then we have
t2 = S/352.8 ..................(2)
substiute for S in (2) using (1)
t2 = (4.9×t12)/352.8 = t12/72 ........(3)
we are given t1+t2 = 25/8...........(4)
using (3) in (4), t1 + t12 / 72 = 25/8 ...(5)
by solving this quadratic equation (5) , we get t1 = 3 second.
Hence the depth S can be obtained from (1) : S = 4.9×3×3 = 44.1 m
Answered by Thiyagarajan K | 12 May, 2018, 10:03: PM
Application Videos
-
Functions of main parts of human eye ...
This video describe Functions of main parts of human eye. -
Power rating
This video shows the calculation of electricity consumed, electric current ... -
Some other formulae for calculating power ...
This video shows explains the application of formula for calculating the po... -
Cost of electricity
This video describes the calculation of cost of electricity for electrical ... -
Combination of resistors -parallel
This video describes the calculation of effective resistance, total current...
Concept Videos
-
Refraction of Light
Explain refraction of light and define rarer/denser medium, refracted ray,... -
Refraction of Light
Explain the rules for the ray diagram for spherical lenses. Draw ray diagr... -
Refraction of Light
Define convex and concave lenses, optical centre, principle axis, centre o... -
Refraction of Light
Define New Cartesian Sign convention, object/image distance, lens formula,... -
Human Eye
Function of cornea, pupil, iris, eye lens, ciliary muscles, rods & cones. ...
CBSE 10 - Physics
Asked by agankitgupta938 | 18 Apr, 2024, 04:29: PM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by infinityupgraded | 13 Apr, 2024, 08:17: AM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by suryamr2019 | 08 Mar, 2024, 04:32: PM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by sheetal.kolte | 04 Mar, 2024, 12:38: PM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by shrilakshmimunoli | 01 Mar, 2024, 01:15: AM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by khajannirwan | 27 Feb, 2024, 10:20: PM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by sailakshmi.avinesh | 13 Feb, 2024, 07:03: AM
ANSWERED BY EXPERT
CBSE 10 - Physics
Asked by saurabhjd527 | 30 Jan, 2024, 07:55: PM
ANSWERED BY EXPERTCBSE 10 - Physics
Asked by saanviyadla | 24 Jan, 2024, 07:06: PM
ANSWERED BY EXPERT
