All posts by grouptwoihs

Salinity and Oxygen Content

While at Stinson Beach, our group measured the salt and oxygen in the ocean water. By filling ten cups with water from different areas and placing the salinity and oxygen probes, connected to a LabQuest device, we were able to measurement the different amounts of oxygen and salt in the water samples. 

Using lab quests to measure salinity and oxygen content
Using lab quests to measure salinity and oxygen content

Albedo, Temperature, and Wind Speed

While we were at Stinson Beach and Mount Tamalpais one of the experiments that we participated in was measuring temperature and wind speed. We used a temperature probe and a wind meter to test for the results. We tested 20 times, however, the data was very similar. About every 10 feet we gathered results starting from the area closest to the beach to the area furthest from the beach. At Mount Tamalpais we did similar things and did it every several feet and specifically targeted areas with tall trees.

During our excursion to Stinson beach and mount Tamalpais, we took two measurements of albedo, temperature and wind speed. The first measurements we took were on the beach itself at regular intervals. We used a light sensor attached to a Lab Quest, which displayed the data on its screen. We took nine measurements of albedo against different surfaces around the area.Then we took measurements on mount tamalpais along a hiking path near large trees. We tested the albedo close to the ground and above the ground nine times.

Below you will find graphs of wind speed, temperature, and albedo on Stinson beach and on mount Tam:

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Crater Experiment

For this experiment we investigated dropping spherical masses into sand. We conducted two different experiments, one dropping the spherical masses into dry sand and the other dropping them in wet sand. We had the choice of which relationships to investigate.

Dry sand:
We chose to study the height from which a spherical mass was dropped in relation to the diameter it creates on impact.

Wet sand:
We chose to study the depth and the diameter of the craters created by the spherical masses in relation to the height at which they were dropped.

This experiment was fairly simple so there were only a few steps.

Use a ruler to flatten out the sand for an even surface to conduct the experiment.
Choose at which heights you will drop the spherical masses from.
Drop the spherical masses from each separate height and measure at each different height the depth and the diameter of the crater.
4. Collect the data and create a graph

Crater of Spherical Mass (Birds' eye view)
Crater of Spherical Mass (Birds’ eye view)
Measuring Crater
Measuring Crater