A well was dug in a village up to the deepest level at which water was available. What is the level of groundwater in the village—the depth of the water surface in the well from the surface of the earth, or the depth from the surface of water in the well to the bottom of the well?

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Solution

The level of groundwater in the village is the the depth from the surface of the water in the well to the bottom of the well.

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Stone dropped in a well hits water surface after 2 sec. What is the depth of well and with what speed will the stone hit the water surface?

Question 11

Water level in a well was 20 m below ground level. During the rainy season, rainwater collected in different water tanks was drained into the well and the water level rises 5 m above the previous level. The wall of the well is 1 m 20 cm high and a pulley is fixed at a height of 80 cm. Raghu wants to draw water from the well. The minimum length of the rope, that he can use is

(a) 17 m
(b) 18 m
(c) 96 m
(d) 97 m

Q. A pebble is dropped freely in a well from its top. It takes

20 s

for the pebble to reach the water surface in the well. Taking

g = 10 m s^{- 2}

and speed of sound

= 330 m s^{- 1}

, find: (i) the depth of water surface from the top, and (ii) the time when echo is heard after the pebble is dropped?

a well of diameter 6m and depth 30m is dug in a field.the earth taken out from the well is spread over a rectangular ground of dimensions 45m*22m .Find the level of ground rise

Q. The radius of a well is

7 m

. Water in it is at a depth of

20 m

and depth of water column is

10 m

. Work done in pumping out water completely from the well is,

(g = 10 m s^{- 2})

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