Q: Answer the following question given this paragraph: What explains buoyant force? Recall from the earlier lesson "Pressure of Fluids" that a fluid exerts pressure in all directions but the pressure is greater at greater depth. Therefore, the fluid below an object exerts greater force on the object than the fluid above the object. This is illustrated in Figure below . Buoyant force explains why objects may float in water. No doubt you've noticed, however, that some objects do not float in water. If buoyant force applies to all objects in fluids, why do some objects sink instead of float? The answer has to do with their weight. Q: What force explains why objects may float in water? Choices: - warm force - cool force - gravity force - buoyant force A:
A: buoyant force

Q: Answer the following question given this paragraph: Polyamides Just as the reaction of a diol and a diacid forms a polyester (Section 15.8 "Preparation of Esters"), the reaction of a diacid and a diamine yields a polyamide. The two difunctional monomers often employed are adipic acid and 1,6-hexanediamine. The monomers condense by splitting out water to form a new product, which is still difunctional and thus can react further to yield a polyamide polymer. Q: Just as the reaction of a diol and a diacid forms a polyester, the reaction of a diacid and a diamine yields this? Choices: - phenol - polyethylene - acetone - polyamide A:
A: polyamide

Q: Answer the following question given this paragraph: Climate change in Earth history was due to natural processes. Recent global warming is due mainly to human actions. The burning of fossil fuels releases greenhouse gases into the air. This creates greater greenhouse effect and global warming. Q: While climate change in earth history was due to natural processes, what is primarily to blame for recent global warming? Choices: - wars - volcanos - factories - human actions A:
A: human actions

Q: Answer the following question given this paragraph: Q: What ensures that seeds germinate only when conditions for seedling survival are optimal? Choices: - germination dormancy - seed forcing - survival dormancy - seed dormancy A:
A: seed dormancy