Master Physics with Fun Quizzes & Brain Teasers!
32) A thrill-seeking cat with mass 4.00 kg is attached by aharnass to an ideal spring of negligible mass and oscillatesvertically in SHM (simple harmonic motion). The amplitude is 0.050m, and at the highest point of the motion the spring has itsnatural unstretched length. Calculate the elastic potential energyof the spring (take it to be zero for the unstretched string), thekinetic energy of the cat, the gravitational potential energy ofthe system relative to the lowest point of the motion, and the sumof these three energies when the cat is:a) at its highest pointb) at its lowest pointc) at its equilibrium position.The answer in the back of the book is given as:(a) 0, 0, 3.9 J, 3.9J(b) 3.9 J, 0, 0, 3.9 J(c) 0.98 J, 0.98 J, 2.0 J, 3.9 J
The difference(s) between recirculating aquaculture systems (RAS) and net penaquaculture operations is/are thatA) unlike net pen aquaculture, RAS operations are very limited in the type offish they can culture; most fish, especially the commercially profitablespecies, do not do well in enclosed facilities.B) RAS facilities are more habitat-friendly than net pen farms, which displacewetland ecosystems, such as mangrove swamps, in coastal areas.C) in contrast to net pen aquaculture, RAS operations are low-tech and easyto set up.D) since RAS operations are very labour-intensive, they are better suited thannet pen systems for developing countries, where labour is cheap and themarket for farm-raised fish is large.E) net pen aquaculture, being biosecure, poses a much lower risk regardingthe escape of non-native species than do RAS operations.