The water level in a well was 20m below ground level. During 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 1m 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
Answers
Answer:
After water level rises 5 m above the previous level, water level is now (20 - 5) = 15 m below the ground level.
Height of the pulley from the ground level = 1 m 20 cm + 80 cm
= 1.2 m + 0.8 m
= 2 m
Therefore, the minimum length of the rope = 15 m + 2 m
= 17 m.
Ans. (a) 17 m
Given : Water level in a well was 20 m below ground level.
During rainy season , rainwater collected in different water tanks was drained in to the well and the water level rises 5 m above the previous level.
The wall of the well is 1 m 20cm high
and a pulley fixed at a height of 80 cm
Raghu wants to draw water from the well
To Find : The minimum length of the rope ,that he can use
Solution:
Water level in a well was 20 m below ground level.
Considering below ground as - ve and above ground as +ve
Water Level = - 20 m
water level rises 5 m above the previous level.
=> New Water level = -20 + 5 = - 15 m
The wall of the well is 1 m 20cm high
and a pulley fixed at a height of 80 cm
=> Height above ground = 1 m 20 cm + 80 cm = 2 m
( as 1 m = 100 cm )
Height above ground = 2 m
Water level = - 15 m
Difference = 2 - (-15) = 17 m
Hence minimum length of the rope is 17 m
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