(vi) What is the speed of sound in oxygen gas at 15°C (For oxygen, R-260J/kgK an

Question

(vi) What is the speed of sound in oxygen gas at 15°C (For oxygen, R-260J/kgK and k-1.4)? A. 73.8 m/s B. 74.8 m/s C. 323.8 m/s D. 332.8 m/s E. 333.9 m/s F. None of the above (vii) A baseball is thrown from east to west with a spin about its vertical axis as shown. Under these conditions it will "break" toward the A. north B. south C. northeast D. southwest west ? East E. west (vii) The drag force acting on a bridge pier is the effect of A. a combination of form drag and skin friction B. a combination of surface roughness and water temperature C. a combination of equivalent sand roughness and skin D. a combination of effects including average water velocities and temperatures E. None of the above (b) Estimate the discharge of water (T=10°C) that flows 2m deep in a long rectangular concrete channel A (n-0.017) that is 4.5m wide and is on a slope of 0.001. You assume that the channel is in a uniform flow condition. may 8 points 4.5 m Figure 6

Explanation / Answer

6) Option - C.

The speed of sound in oxygen

Speed V = (K*R*T)0.5

Speed = V = (1.4*260*288)0.5 = 323.77

7) Option - D.

the baseball is most likely to fail in the south-west direction.

8) Option - A

The drag force is the force acting due to form drag and skin friction.

b)

The width of the channel =b= 4.5 m

The depth of channel = y = 2 m.

Rectangular area = S = 4.5 *2 = 9 m2.

Slope = 0.001.

n = 0.017

wetted perimeter = O = b+2y = 4.5+2* 2= 8.5 m.

Hydraulic radius = R = S/O = 9/8.5 = 1.058

Velocity coefficient =C= (1/n)*R1/6 = (1/0.017)*(1.058)1/6 = 59.37 m0.5 sec-1

Velocity from chezy equatio = V = C(R*i)0.5

Discahrge = Q = C*S*(R*i)0.5.

where i = slope = 0.001

Q = 59.37*9(1.058*0.001)0.5 = 17.38 m3/sec

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