Question
Why should we adopt crop rotation?
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Explain why, a wide steel belt is provided over the wheels of an army tank.

A wide steel belt is provided over the wheels of an army tank.
A force of 50N acts on a body and moves it a distance of 4m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Draw a labelled diagram to show the multiple reflections of sound in apart of the stethoscope tube.
What types of functions does the single cell of multicellular organism perform?