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.
1 Grill the ribs for 2 hours, bone-side down. 2  Wrap them in foil and grill, bone-side up, for 30 minutes. 3  Don't be afraid to add an extra special touch here by pouring a cup of apple cider or juice into the foil packet.4  Unwrap them and grill for 30 more minutes bone-side down.efore we get into how long you should grill your ribs there's one important thing to keep in mind: while dry spice rubs should be applied before you start to cook, sauces should not be applied until the last 20 minutes of cooking at the earliest.