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alexandr1967 [171]
3 years ago
14

A 2kg object is tied to the end of a cord and whirled in a horizontal circle of radius 2 m. If the body makes three complete rev

olutions every second,
what is its linear speed?

And what is its centripetal acceleration?
Physics
1 answer:
Travka [436]3 years ago
5 0

Answer:

a) 37.70 m/s

b)710.6 m/s²

Explanation:

Given that ;

Mass of object = 2 kg

Radius of the motion = 2m

Frequency of motion = 3 rev/s

The formula to apply is;

v= 2πrf   where v is linear speed

v = 2×π×2×3 =12π = 37.70 m/s

Centripetal acceleration is given as;

a= 4×π²×r×f²  

a= 4×π²×2×3²

a=710.6 m/s²

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Answer:

The correct option is (b).

Explanation:

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We know that, the work done is equal to the kinetic energy of an object i.e.

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