4. (1 pt) True False: The geostrophic wind is directed parallel to isobars with

Question

4. (1 pt) True False: The geostrophic wind is directed parallel to isobars with lower pressure to the left in the Northern hemisphere. 5. (1 pt) True False: A cyclone has relatively low pressure at its center 6. (1 pt) True False: The pressure gradient acceleration may be equivalently written as 7. (1 pt) True / False: A region of low pressure on a surface of constant altitude is 8. (1 pt) True False: For a given latitude and pressure surface, the geostrophic wind an acceleration "downhill" by gravity on a surface of constant pressure. equivalent to a region of high geopotential heigh t on a surface of constant pressure will be stronger in regions where the geopotential height contours are closer together 9. (1 pt) True False: Thermal wind balance states that the horizontal rate of change of the geostrophic wind speed is directly related to the vertical rate of change of temper- ature 10. (1 pt) True False: Temperature typically changes most rapidly with latitude in the vicinity of the jet stream because the wind shear of the zonal wind is typically largest beneath the jet stream.

Explanation / Answer

4.The geostrophic wind is the theoretical wind that would result from an exact balance between the Coriolis force and the pressure gradient force. This condition is called geostrophic balance. The geostrophic wind is directed parallel to isobars (lines of constant pressure at a given height).
The geostrophic balance helps to explain why, in the northern hemisphere, low-pressure systems (or cyclones) spin counterclockwise and high-pressure systems spin clockwise.
And so the statement is true.

5.In meteorology, a cyclone is a large scale air mass that rotates around a strong center of low atmospheric pressure. So the statement is true.

6.Gravity accelerates objects down inclined planes — but not the full force of gravity; only the component of gravity acting along the downhill accelerates the object. That’s why an object rolling downhill rolls quickly. So the statement is true.

7.

Geopotential height approximates the actual height of a pressure surface above mean sea-level. Therefore, a geopotential height observation represents the height of the pressure surface on which the observation was taken.

Since cold air is more dense than warm air, it causes pressure surfaces to be lower in colder air masses, while less dense, warmer air allows the pressure surfaces to be higher. Thus, heights are lower in cold air masses, and higher in warm air masses.
As both are equivalent to once another, this statement holds true.

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