1 The dependent variable would be the amount of liquid absorbed by a paper towel. 2  In an experiment to determine how far people can see into the infrared part of the spectrum, the wavelength of light is the independent variable and whether the light is observed (the response) is the dependent variable.
2. Cook the ribs slowly for 1-1/2 to 2 hours, over medium heat (325Â° to 350Â°) and over a drip pan half filled with water. Long, slow cooking makes for moist and tender ribs with a crisp crust. If in the first 30 minutes the ribs are browning too quickly, shut the grill vents. 3. Determining when pork ribs are done is a little tricky, but after 1-1/2 to 2 hours, you can be virtually certain that the ribs are fully cooked.
3. Grill the ribs. This is the easy part! Place the ribs over indirect, medium heat on your grill. The temperature should be about 325 degrees F. Cover the grill, and cook the ribs for approximately two hours. Do not check on the ribs for the first 30 minutes â this is crucial! If you open the grill too many times, you put the ribs at risk of drying out. After the two hours are up, use a fork to make sure the ribs pull off the bone easily. If so, they are done.