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Question

A car of mass 1000 kg moves in a circular path with a constant speed of 12 m/s. It is turned by 180, while travelling a distance of 628 m on the road. The centripetal force acting on the car is

A
1440 N
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B
320 N
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C
720 N
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D
640 N
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Solution

The correct option is C 720 N
Given, mass of car (m)=1000 kg
Speed of car (v)=12 m/s
To find centripetal force:
Fc=mv2r

We need to find r

To find r: Given that car has turned 180 after travelling 628 m, distance covered for half circle is,

πr=628r=200 m (π=3.14)

Hence the centripetal force will be,
Fc=1000×(12)2200=720 N

Option C is the correct answer

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