PHYS 102 Week 4 Discussion

PHYS 102 Week 4 Discussion | Assignment Help | ERAU 

Module 4 Discussion MMT

Instructor:

Each student will create a problem or experiment, illustrating one of the concepts covered in this module, and share it in your initial Discussion Board posting. A template for both of these posts can be found in my online office and course syllabus. You must make your initial 250-word post and then post a reply of at least 200 words to the initial posts of two or more of your fellow students  The instructor will be actively engaged and contributing to the Discussion Board activities throughout the module.  Points will be deducted for poor grammar, misspelled words, improperly cited web/textbook references, late initial posts, and posts made all at one time (do not “post and run”).  Posts made after the end of the module will be reviewed by your instructor, but you will not get any credit for them.  In addition to your individual posts, the instructor will post questions relative to the topics being covered in that Module. Each student is expected to respond to those questions in addition to the posts described above.

Students:  You will receive no points for a plagiaristic post of material and/or the majority of the post is not original work (in your own words—i.e., cut/paste content from a website or paper).

 We didn’t have enough time in class Thursday to discuss the idea of specific gravity. The specific gravity of a liquid tells you how much more or less dense the liquid is than water.  Water has a specific gravity of 1.000 (near 4°C).  If a liquid or object is denser than water, then its specific gravity is greater than 1.  If it is less dense than water, then the specific gravity is less than 1.  To calculate the specific gravity of a liquid or object, you have to know its density.  Take the density of the liquid or object, divided by the density of water (1 gm/cm³), and you will get the specific gravity of the liquid or object:

            Specific Gravity = (density of liquid or object / (1 gm/cm³)

Specific gravity is also related to buoyancy. The denser a liquid is, the greater the force of buoyancy will be on an object floating in/on it (the higher it will float).  You can calculate the magnitude of the buoyancy force like this:

            F_buoyancy = (density of liquid) x (volume of object) x (acceleration of gravity)

When answering the question of whether an object will float in water the following applies: If an object has a specific gravity greater than water it will sink. If it has a specific gravity less than water it will float.

Now for my question. If we place a can of Pepsi and a can of Diet Pepsi in a sink full of water, one of them will float and one will sink. Which one do you think will sink and which one do you think will float? (Hint: to answer this question you need to calculate the density of Diet Pepsi and Pepsi and also calculate their Specific Gravity). Have some fun with it and try the experiment for yourself. Better yet, do the experiment for your friends. They will be amazed at how smart you are!