Compute the speed of geostrophic wind blowing parallel to the isobars in the northern hemisphere at latitude of 40° N. The spacing between the isobars is 200 km and pressure difference is 4 mb. The altitude is 5600 m above sea level, where the air temperature is -25°C and air density is 0.70 kg/m3. [Given sin(40°) = 0.64 and Earth's rotation (Ω) = 7.3 × 10-5 radian/sec]
1
Vg = ~36.6 m/sec
2
Vg = ~30.6 m/sec
3
Vg = ~28.6 m/sec
4
Vg = ~38.2 m/sec