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21 Ιαν 2021 · In this problem there are only conservative forces (namely, gravity). The mechanical energy is conserved: We already found the initial kinetic energy of the snowball: Ki = 300 J. Using Ugrav = mgy (with y = 0 at ground level), the initial potential energy is Ui = 0. Then we can find the final potential energy of the snowball:
Example 1: A 14 300 kg airplane is flying at an altitude of 497 m at a speed of 214 km/h. Determine. the airplane's total mechanical energy. Remember to convert the speed into metres per second. 14300(59. ̄4)2+14300(9.81)(497) scalar. We can treat this flying airplane as a system.
What is its total mechanical energy? (mechanical energy includes kinetic, gravitational potential, and elastic potential but not internal forms of energy such as thermal or chemical)
How do conservative and non-conservative forces affect the conservation of mechanical energy? Answer: Conservative forces, like gravity, do not change the total mechanical energy of a system. They might convert potential energy to kinetic energy or vice-versa, but the sum remains constant.
6. An object has a mechanical energy of 1575 J and a potential energy of 1265 J. a. What is the kinetic energy of the object? b. If the mass of the object is 12 kg, what is its speed? c. How high above ground is the object? 7. A 5 kg object is moving downward at a speed of 12 m/s. If it is currently 2.6 m above the ground… a. What is its ...
Calculate the mechanical energy of the particle using (a) the origin as the reference point and (b) x = 4.0 m as the reference point. (c) Find the particle’s velocity at x = 1.0 m. Do this part of the problem for each reference point.
terms of the conservation of energy. 28. You tell your friend that no machine can possibly put out more energy than is put into it, and your friend states that a nuclear reactor puts out more energy than is put into it. What do you say? 29. The energy we require to live comes from the chemically stored potential energy in food, which is
