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.
Step 2. Place the ribs on the grill, directly over the flames. Grill for about 8 to 10 minutes on one side, then turn them over using barbecue tongs and grill the other side for another 8 to 10 minutes.Brush the ribs with a prepared barbecue sauce on both sides a few minutes before you take them off the grill.ontinue basting the ribs every 30 minutes or so. Cook for a total of 3 to 5 hours, including the first 90 minutes, until the ribs are extremely tender and just starting to fall apart. At that level of tenderness, the ribs should reach at least 170 F in temperature.