Question

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Answer 1

Answer:

Nitrogen Can be Replenished in the Soil by Growing Leguminous Crops. ... The remaining nitrogen compounds made by Rhizobium bacteria mix with the soil in the field and enrich it. Thus, the soil in the fields gets enriched with nitrogen compounds in the natural way.

Explanation:

hope it helps

Answer 2

Provided that:

• Mass of the ball = 20 g
• Time taken = 10 seconds
• Final velocity = 0 mps
• Initial velocity = 20 cm/s

To calculate:

• The force

Solution:

• The force = -0.0004 N

Knowledge required:

• SI unit of force = Newton
• SI unit of velocity = m/s
• SI unit of time = sec
• SI unit of mass = kg

Using concepts:

• Formula to convert g into kg
• Formula to convert cm/s - mps
• Formula to calculate the force

Using formulas:

• Formula to convert grams into kilograms is mentioned below:

• ${\small{\underline{\boxed{\sf{1 \: g \: = \dfrac{1}{1000} \: kg}}}}}$

• Formula to calculate force is mentioned below:

• ${\small{\underline{\boxed{\sf{F \: = m\bigg(\dfrac{v-u}{t}\bigg)}}}}}$

• Formula to convert centimetres per second into metre per second:

• ${\small{\underline{\boxed{\sf{1 \: cms^{-1} \: = \dfrac{1}{100} \: ms^{-1}}}}}}$

Where, F denotes force, m denotes mass, v denotes final velocity, u denotes initial velocity and t denotes time taken.

Required solution:

~ Firstly let us convert grams into kilograms by using suitable formula!

$:\implies \sf 1 \: g \: = \dfrac{1}{1000} \: kg \\ \\ :\implies \sf 20 \: g \: = \dfrac{20}{1000} \: kg \\ \\ :\implies \sf 20 \: g \: = \dfrac{2}{100} \: kg \\ \\ :\implies \sf 20 \: g \: = 0.02 \: kg \\ \\ {\pmb{\sf{Henceforth, \: converted!}}}$

~ Now let us convert centimetres per second into metre per second!

$:\implies \sf 1 \: cms^{-1} \: = \dfrac{1}{100} \: ms^{-1} \\ \\ :\implies \sf 20 \: cms^{-1} \: = \dfrac{20}{100} \: ms^{-1} \\ \\ :\implies \sf 20 \: cms^{-1} \: = \dfrac{2}{10} \: ms^{-1} \\ \\ :\implies \sf 20 \: cms^{-1} \: = 0.2 \: ms^{-1} \\ \\ {\pmb{\sf{Henceforth, \: converted!}}}$

~ Now let us calculate the force by using suitable formula!

$:\implies \sf F \: = m\bigg(\dfrac{v-u}{t}\bigg) \\ \\ :\implies \sf F \: = 0.02 \cdot \bigg(\dfrac{0-0.2}{10}\bigg) \\ \\ :\implies \sf F \: = 0.02 \cdot \bigg(\dfrac{-0.2}{10}\bigg) \\ \\ :\implies \sf F \: = \dfrac{-0.004}{10} \\ \\ :\implies \sf F \: = \dfrac{-4}{10000} \\ \\ :\implies \sf F \: = -0.0004 \: Newton \\ \\ :\implies \sf Force \: = -0.0004 \: Newton$