Give reason standard physical quantity is used for correct measurement of the given body

2 answers:

6 0

Standard physical quantity is used for measurement because they are the components of a given body that can be measured using physical measuring tools and are less prone to errors; weighing balance, Rule are some of the measuring tools

Physical and non-physical quantities can be measured but the measurement carried out on physical quantities are less prone to error, when compared to non-physical measurement. Non-physical measurements are carried out using the Ordinal scale ( more or less an estimate measurement )

Examples of physical quantities includes : mass , height , temperature while Non-physical quantities includes : anger , personal feelings e.t.c

Hence the reason why standard physical quantities are used is because they are measured using measuring tools and are less prone to error

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PtichkaEL [24]3 years ago

4 0

Answer:

Physical quantities are the substances which can be measured. By measuring physical quantities, we can measure the mass, weight and other physical properties

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The body weighing 2 kg moves through the horizontal surface and crosses the path x = 75 cm The coefficient of friction of the bo

Taya2010 [7]

The kinetic energy of the body in definitive position is 4.24 J.

Explanation:

As per the work energy theorem, the work done on any system or object to move it from one position to another is equal to the change in kinetic energy of the object. In this case, the body weighing 2 kg is moved over an horizontal surface for a distance of 75 cm. As there will be frictional force acting on the body while moving over the surface. This frictional force multiplied by the distance the object is moved will give the work done on the body.

Frictional force = Coeffficent of friction × Normal force.

As the weight of the body is 2 kg, the normal force acting on it will be mass multiplied with acceleration due to gravity.

Frictional force = - 0.8×9.8 × 2 =-15.68 N

So the work done will be the product of frictional force with the displacement of 75 cm or 0.75 m.

Work done = Frictional force × Displacement

Work done = -15.68×0.75 = -11.76 J.

So the work is done by the object.

If the kinetic energy of the body at starting is 16 J, then the kinetic energy of the body at definitive position will be obtained as below.

Work done = change in kinetic energy

-11.76 J = Final kinetic energy-16 J

Final Kinetic energy = - 11.76+16

Final kinetic energy = 4.24 J