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Soni says that the acceleration in an ob...

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her ? Why ?

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To determine whether Soni's statement that the acceleration of an object could be zero even when several forces are acting on it is correct, we can analyze the situation step by step. ### Step-by-Step Solution: 1. **Understanding Forces**: - When multiple forces act on an object, they can either add up to create a net force or cancel each other out. 2. **Balanced Forces**: ...
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Direction : Resistive force proportional to object velocity At low speeds, the resistive force acting on an object that is moving a viscous medium is effectively modeleld as being proportional to the object velocity. The mathematical representation of the resistive force can be expressed as R = -bv Where v is the velocity of the object and b is a positive constant that depends onthe properties of the medium and on the shape and dimensions of the object. The negative sign represents the fact that the resistance froce is opposite to the velocity. Consider a sphere of mass m released frm rest in a liquid. Assuming that the only forces acting on the spheres are the resistive froce R and the weight mg, we can describe its motion using Newton's second law. though the buoyant force is also acting on the submerged object the force is constant and effect of this force be modeled by changing the apparent weight of the sphere by a constant froce, so we can ignore it here. Thus mg - bv = m (dv)/(dt) rArr (dv)/(dt) = g - (b)/(m) v Solving the equation v = (mg)/(b) (1- e^(-bt//m)) where e=2.71 is the base of the natural logarithm The acceleration becomes zero when the increasing resistive force eventually the weight. At this point, the object reaches its terminals speed v_(1) and then on it continues to move with zero acceleration mg - b_(T) =0 rArr m_(T) = (mg)/(b) Hence v = v_(T) (1-e^((vt)/(m))) In an experimental set-up four objects I,II,III,IV were released in same liquid. Using the data collected for the subsequent motions value of constant b were calculated. Respective data are shown in table. {:("Object",I,II,II,IV),("Mass (in kg.)",1,2,3,4),(underset("in (N-s)/m")("Constant b"),3.7,1.4,1.4,2.8):} At the start of motion when object is released in the liquid, its acceleration is :

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  9. A force of 7N acts on an object. The displacement is, say 8m, in the d...

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  10. When do we say that work is done ?

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  11. Write an expression for the work done when a force is acting on an obj...

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  12. Define 1 J of work.

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  14. What is the kinetic energy of an object ?

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  15. Write an expression for kinetic energy of an object.

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  16. The kinetic energy of an object of mass m moving with a velocity of 5 ...

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  18. Define 1 W of power.

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