1. Which two forces are equal and opposite in hydrostatic balance? Pressure grad

Question

1. Which two forces are equal and opposite in hydrostatic balance? Pressure gradient force and gravity a. b. Pressure gradient force and Coriolis force Coriolis force and friction c. d. Gravity and Coriolis force You are looking at a surface weather map and the isobars are curved. What assumption can you make about the atmosphere depicted in the weather map? 2. a. You can assume the atmosphere is in geostrophic balance. b. You can assume the atmosphere is in gradient wind balance. c. You can assume the horizontal forces on the atmosphere are the pressure gradient force, Coriolis force and friction force

Explanation / Answer

b. Pressure gradient force and coriolis force. Explanation : these two forces balance each other and the friction is too small to consider compared to the other two forces above. b. You can assume the atmosphere is in gradient wind balance. Explanation : once frictional force acts then the condition will change from geostrophic to gradient wind balance with isobars showing curved trajectory.

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