Physics, Energy - 2386 Words

Romar M. Cabinta EXERCISES 15 WORK, ENERGY, AND POWER A. CONCEPTUAL QUESTIONS 1. Is work done when you move a book from the top of the desk to the floor? Why? Yes. It is because the displacement of the book from the top of the desk to the floor and the force that is applied to the book is parallel with one another. 2. State the law of Conservation of Mechanical Energy in two ways? The law of conservation of energy states that energy may neither be created nor destroyed. Therefore the sum of all the energies in the system is a constant. TMEinitial=TMEfinal 3. Explain the basic ideas that govern the design and operation of a roller coaster. A roller coaster is operated and designed through the†¦show more content†¦A tandem (two-person) bicycle team must overcome a force of 34 lbs. to maintain a speed of 30 ft./s. Find the power required per rider, assuming they contribute equally. Express your answer in horsepower. F=34 lb F1=17 lb=F2 P1=F1v=17 lb30fts=510 ftlbsÃâ€"1hp550 ftlbs=0.93 hp P2=F1v=17 lb30fts=510 ftlbsÃâ€"1hp550 ftlbs=0.93 hp 5. A pump is required to lift 200 L of water per minute from a well 10 m deep and eject it with a speed of 20m/s. (a) How much work is done per minute in lifting the water? (b) How much in giving its kinetic energy? What horsepower engine is needed if it is 80% efficient? a.) W=mgh+12mv2=200kgÃâ€"10mÃâ€"9.81kgm2+12Ãâ€"200kgÃâ€"20ms2=59620Js=993.67J/min b.) W=12mv2=12200kg20ms2=40000 J c.) HP=59620jsà ·0.8Ãâ€"746js=99.899 hp EXERCISES 16 LINEAR MOMENTUM A. CONCEPTUAL QUESTIONS 1. Which has greater momentum, a ten wheeler truck at rest or a moving motorcycle? Why? A moving motorcycle has a greater momentum than the truck. A truck at rest has zero momentum because an object has to be moving in order to have a momentum. 2. How does impulse differ from force? Impulse is the product of force and the time interval of the application of force; while force is just a factor that affects an object’s impulse when it is at motion. 3. Why is it incorrect toShow MoreRelatedThe Physics Of Thermal Energy1609 Words   |  7 Pages Thermal Energy in Peanuts Kristin Guenev, Hannah Potter, Rebecca Fluegel At the ignition of a peanut, how much thermal energy is produced? The same energy that is emitted at the burning of a single peanut contains the same principles that heat our homes, cook our food, or why we feel cold in the winter and warm in the summer. Though much associated with temperature, thermal energy is not the same. 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ThatRead MoreQuantum Mechanics and Islam Essay1602 Words   |  7 Pages Introduction Quantum mechanics or also known as quantum physics is a field of science which studies the behaviour of particles at sub-atomic level. This theory tells us that short-lived pairs of particles and their antiparticles are constantly being created and destroyed in an apparently empty space. In quantum mechanics the weird behaviour of electrons are not accurately explained and until now not a single theory is acceptable by the whole scientific community to postulate the phenomena. The