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.
Cook them for 1.5 to 2 hours, with the meatiest portion downward. Turn the ribs occasionally. If you are using a gas grill, you can ignite one side of the grill and leave the other to cook the ribs. Place the ribs on the side that is not ignited. Grill the ribs for 30 to 45 minutes on each side. If your ribs are too large to cook indirectly on either a charcoal or gas grill, wrap them in heavy duty aluminum foil. Place them on the grill over direct heat for 30 minutes on each side for a gas grill and 30 to 45 minutes each side for a charcoal grill.