How Surface Area to Volume Ratio Affects the Rate of Heat Loss
Aim
The aim of this investigation is to answer the following questions:
Why do elephants have trouble cooling down? And why do mice have
trouble keeping warm.
Apparatus
5x cans (5 different sizes)
1x Bunsen burner
1x heatproof mat
1x Thermometer
1x Ruler
1x Kettle
1x Stopwatch
1x Tripod
1x Gauze
1x Clamp and stand
Plan
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* Label each can from A to E in ascending order, A the biggest and E
the smallest. A representing the mouse and E representing the
elephant.
* Measure and record the height and diameter of each can.
* Fill can A to the top with boiling water out of the kettle.
* Bring the water back up to a temperature of 100 degrees Celsius,
to make sure it is a fair test and that all the cans start from
100 degrees Celsius.
* Use a clamp and stand to hold the thermometer inside the can,
position it so that the bulb of the thermometer is in the centre
of the can.
* With a stopwatch ready to start timing, switch off the gas to turn
off the Bunsen burner and start timing.
* Read and record the temperature on the thermometer every two
minutes for twenty minutes.
* Repeat this for all of the other cans, twice for each one and make
a recording of all the temperatures, and work out the averages.
Safety
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* Always wear safety glasses during the practical to protect the
eyes and avoid any hot water being splashed into them.
To make sure it is a fair test; the procedure is repeated a couple of
Since this test has been devised, the number one question everybody is asking is, “ isn’t it unfair to base a student’s entire future on one test, when he or she simply could have had a bad day when taking the test”? The president Kirk T. Schroder of the Virginia Board of Education, answer this question by saying, “First of all, these tests are untimed, so no student is under arbitrary time pressure in taking the test.
because they had all scored too low on the initial exam to be put into
* Then we would weight the bag and record it in a chart before we put
Discretion in the intake screening. It does not matter who looks at the case they always use
Testing must be performed on a pre-established schedule and will be executed under supervision of the qualified individual to validate the sampling; besides, must be implemented by third party testing services, and the Instruments used for analysis should be calibrated in accordance with established procedures.
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to see if the suspect is anywhere around then they checked to determine the two
In an effort to make drug testing for employees of the federal government more accurate, to deter false positives and false negatives it has been suggested to use alternative methods of testing. The Associated Press reported a movement by the federal government to "overhaul its employee drug testing program". (TAP, pg 1) Currently, the government tests its employees during the pre-employment selection and when accidents
who administers a series of test that must be passed, which points out normal or abnormal
An Investigation Into The Effect Of Surface Area on Volume Ratio On The Rate Of Heat Loss Heat loss from an object is affected by its surface area to volume ratio (SA/V). The smaller the SA/V the faster heat is lost by conduction, convection and radiation. Other factors may influence the rate of heat loss by the above physical processes, e.g. insulation type or thickness Task Prepare a detailed written plan for an investigation to determine the effect of vessel size on the rate of heat loss. The investigations can use the normal range of laboratory equipment and should take no more than eighty minutes to complete. Include: · A concise, testable hypothesis, explained by an introduction.
Everyone has to wait for that last student, the slowest one that takes their time, and uses it to their advantage. Students deceit do, anything until everyone has executed the test. Others will say the extra time students get can be used for something else, but everything that anyone does now is noisy.
...o be extremely careful especially with their new test in 2005, to have a test that is perfectly fair and allows every student to show his/her skills.
1. Legal Arguments: Examples of legal concerns surrounding the practice of mandatory testing include constitutional i...