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Amar Kumar 8 years, 3 months ago
Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.
First law: In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.
Second law: In an inertial reference frame, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. ( mass m is constant)
Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
Posted by Kartik Gupta 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Earthworm has various openings and structures on ventral surface. Single median opening per segment is present towards the dorsal surface through which coelomic fluid oozes out.
Ventral side of earthworm could be identified by presence of locomotory structures, called setae . These are microscopic, present in rows.
Then there are paired openings of seminal receptacles , and male genital pores . Male genital pores are often associated with genital papillae on adjacent segments. Earthworm is hermaphroditic, so paired female genital pores are also present towards ventral side.
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Amar Kumar 8 years, 3 months ago
An ecosystem is a community of plants, animals and smaller organisms that live, feed, reproduce and interact in the same area or environment.These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows.
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yes. when a body is not in motion, it possess potential energy due to its position.
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The energy possessed by body due to its motion is called kinetic energy. K.E = {tex}mv^2/2{/tex}
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