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Question

You are riding in an automobile of mass 3000 kg. Assuming that you are examining the oscillation characteristics of its suspension system, the suspension hangs 15 cm when the entire automobile is placed on it. Also, the amplitude of oscillation decreases by 50% during one complete oscillation. The values of the spring constant k and the damping constant b for the spring and shock absorber system of one wheel (assuming that each wheel supports 750 kg) are:


A

2×105 Nm1, 1.8 kg s1

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B

5×104 Nm1, 8.1 kg s1

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C

2×105 Nm1, 1344 kg s1

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D

5×104 Nm1, 1344 kg s1

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Solution

The correct option is D

5×104 Nm1, 1344 kg s1


Give, mass of the automobile m = 3000 kg

Since the suspension sags by 15 cm when the entire automobile is placed on it, we must remember there are four wheels hence four suspensions.

We have weight of entire vehicle = spring force due to four suspensions

3000×g=k×(15100)×4

3000×10=k×15100×4k=5×104 Nm1

We know the time dependence of amplitude during oscillation

A(t)=A0ebt2m

In one time period A(T)=A02 (is what is given)

A02=A0ebt2m

In2=bt2m

Also ω=kmb24m2T=2πfrackmb24m2

In2=b×2π2mkmb24m2

m2 (ln2)2=b2π2kmb24m2

(ln2)2 m2(kmb24m2)=b2π2

(ln2)2mk(ln2)24b2=b2π2

(ln2)2mkπ2+(ln2)24=b2

b1344 kg/s


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