What is a Stevenson's screen and longitude? When the local time is 2.00 pm at longitude 45 E, what is the…

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What is a Stevenson's screen and longitude? When the local time is 2.00 pm at longitude 45 E, what is the longitude of a place whose local time is 10.00 am?

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b) Three characteristics of a Stevenson's screen:

It is painted white to reflect solar radiation and prevent heat absorption.
It has double-louvred sides to allow free air circulation while shielding instruments from direct sunlight and precipitation.
It is made of wood, which is a poor conductor of heat, further insulating the instruments from external temperature fluctuations.

4 a) What is a longitude?
Longitude is the angular distance, measured in degrees, east or west of the Prime Meridian. Lines of longitude, called meridians, run from the North Pole to the South Pole.

4 b) When the local time is 2.00 pm at longitude 45 E, what is the longitude of a place whose local time is 10.00 am?

Calculate the time difference between the two places.
$\text{Time difference} = 2:00 \text{ pm} - 10:00 \text{ am} = 4 \text{ hours}$
Convert the time difference into longitude difference.
Since the Earth rotates $15^\circ$ in one hour:
$\text{Longitude difference} = 4 \text{ hours} \times 15^\circ/\text{hour} = 60^\circ$
Determine the direction of the unknown longitude.
Since the local time (10:00 am) is earlier than the known time (2:00 pm), the place must be to the west of $45^\circ \text{ E}$ .
Calculate the longitude of the place.
$\text{Longitude} = 45^\circ \text{ E} - 60^\circ = -15^\circ$
A negative value indicates a longitude in the Western Hemisphere.
The longitude of the place is $\boxed{\text{15° W}}$ .

5 a) What is weather forecasting?
Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. It involves analyzing current weather conditions to project future weather patterns.

5 b) State three significance of weather forecasting:
- Agriculture: Helps farmers decide on planting, harvesting, and irrigation schedules to optimize crop yields.
- Aviation and Shipping: Provides crucial information for safe navigation, helping pilots and captains avoid dangerous weather conditions.
- Disaster Preparedness: Enables early warnings for extreme weather events like floods, hurricanes, or droughts, allowing communities to prepare and minimize damage.

What is a Stevenson's screen and longitude? When the local time is 2.00 pm at longitude 45 E, what is the longitude of a place whose local time is 10.00 am?

Step-by-step solution

Calculate the time difference between the two places.

Convert the time difference into longitude difference.

Determine the direction of the unknown longitude.

Calculate the longitude of the place.

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