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The average  mass  of rain  drops  is  3.0x10-5 kg and their average terminal velocity is 9 m/s.  Calculate the energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.

  • Option 1)

    3.5 x 105 J

  • Option 2)

    4.05 x 104 J

  • Option 3)

    3.0 x 105 J

  • Option 4)

    9.0 x 104 J

 

Answers (2)

best_answer

As we have learned

Kinetic energy -

k= \frac{1}{2}mv^{2}

- wherein

m\rightarrow mass

v\rightarrow velocity 

Kinetic Energy is always positive.

 

 Total volume of water in 1 m^2  area = 1 m^2 \times 100 cm = 1 m^3

Total mass in 1 m^2 area = \rho v = 10 ^3 \times 1 Kg = 10 ^3 Kg

Kinetic energy = 1/2 \times 10 ^3 \times 9 ^2 = 4.05 \times 10 ^ 4 J

 

 

 

 

 

 

 


Option 1)

3.5 x 105 J

Option 2)

4.05 x 104 J

Option 3)

3.0 x 105 J

Option 4)

9.0 x 104 J

Posted by

SudhirSol

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