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• Complete JEE Main/Advanced Course and Test Series
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```JEE Main/Advanced 2008 Physics Answer Key

1) 4

2) 3

3) none

4) 2

5) 4

6) 2

7) 2

8) 1

9) 1

10) 3

11) 3

12) 1

13) 4

14) 2

15) 2

16) 3

17) 1

18) 3

19) 1

20) 3

21) 1

22) 3

23) 1

24) 1

25) 1

26) 1

27) 2

28) 3

29) 4

30) 4

31) 4

32) 3

33) 4

34) 2

35) 4

1.

Momentum = mass x velocity

Momentum = 3.513 x 5.00 = 17.565 kg m sec-1

Momentum in three significant digit = 17.6 kg m sec-1

2.

Moment of Inertia of a body is the inertia of a rotating body with respect to the axis of rotation.

Moment of Inertia of the square plate at the center of the axis (vertical axis) = ma2/6

Moment Inertia at the axis passing through corner = Icenter + m d2 = ma2 + m(a/√2)2 = 2/3 ma2

3.

Speed of the sound in gas

V = √(γRT/m)

R = gas constant(8.314 J/mol K)

T = the absolute temperature

M = the molecular weight of the gas (kg/mol)

g = adiabatic constant = cp/cv

gO2 = 7/5

gHe = 5/3

MO2 = 32

MHe = 4

460 = √(7RT/5x32)                       ...... (i)

VHe = √(5RT/3x4)                         ...... (ii)

By solving (i) and (ii) VHe = 1419 m sec-1

```
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