Question

we take three seeds and put it into separate beaker A,B,C with soil . after that mix cow dung in beaker A , chemical fertilizers in beaker B , and in beaker C nothing now see the changes
who grows higher A B or C ​

Answer 1

Answer:

Uanjajaja

Hajajaja

Ajjajajak

Jajjaja

Answer 2

Answer:

Given :-

Mass of the girl = 40 kg

Number of steps she climbed = 30 sec

Time taken to climb the steps = 10 sec

Height of each step = 0.1 m

To Find :-

The power developed by the girl.

Analysis :-

Firstly, find the work done by substituting the given values such that work done is equal to mass into gravity into height.

Then you can easily find the power by the formula power is equal to work done divided by the time taken.

Solution :-

We know that,

p = Power

g = Gravity

w = Work done

h = Height

m = Mass

t = Time

Using the formula,

\underline{\boxed{\sf Work \ done=Mass \times Gravity \times Height}}

Work done=Mass×Gravity×Height

Given that,

Mass (m) = 40 kg

Gravity (g) = 10 m/s

Height (h) = 0.1 m

Substituting their values,

⇒ w = mgh

⇒ w = 40 × 10 × 0.1

⇒ w = 40 J

Using the formula,

\underline{\boxed{\sf Power=\dfrac{Work \ done}{Time \ taken} }}

Power=

Time taken

Work done

Given that,

Work done (w) = 40 J

Time (t) = 10 sec

Substituting their values,

⇒ p = w/t

⇒ p = 40/10

⇒ p = 4 W

Therefore, the power developed by the girl is 4 W.