Julia wants to find out which color fabric will heat up the fastest when put under a direct light. So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes. Will Julia's results be valid?

Question

Julia wants to find out which color fabric will heat up the fastest when put under a direct light.  So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes.  Will Julia's results be valid?

anonymous · Answer

Walter learned in science class that different substances release heat at different rates. He decides to test this.

At home, Walter turns the oven to 200°F. He places three casserole dishes in it: one is made of metal, one is made of glass, and one is made of ceramic. He leaves them in the oven for an hour. He then removes them from the oven, places a single ice cube on each one, and times how long it takes the ice cube to melt.

In this experiment, what is the test variable (independent variable)?

    the volume of each ice cube
    the amount of time it takes for the ice to melt
    the material each pan is made of
    the temperature of each pan

thatonegirl_ · Answer

To the firsts question.. no her results won't be valid because she has too many variables. There should only be on thing different (the color fabrics) and everything else should be the same, including the light source.

To your second question... it is the material each pan is made of. The independent variable is the thing that you change (remember the "i" in independent is for I change").