question 1
(FM-Petrópolis-RJ) On February 15, 2014, in Donetsk, Ukraine, the pole vault world record was broken by Renaud Lavillenie with the 6.16 m mark. In this type of jump, the athlete performs a run and uses a pole to get over the "slat" - term used to refer to the suspended horizontal bar, which must be surpassed in the jump. Considering that it passed the batten with a horizontal velocity of the order of 1 cm/s, product of the energy transformations that occurred during the race, after losing contact with the pole, at the highest point of its trajectory, the mechanical energy associated with the athlete was:
a) only kinetics.
b) only elastic potential.
c) only gravitational potential.
d) only kinetics and gravitational potential.
e) kinetics, elastic potential and gravitational potential.
question 2
(Unicamp-SP) Wind energy is the kinetic energy contained in the wind. Its use occurs through the conversion of the kinetic energy of translation into kinetic energy of rotation and, with the use of wind turbines, also called aerogenerators, energy is generated electric. There are currently, in the region that produces the most wind energy in Brazil, 306 plants in operation, with the electricity generation potential of approximately 7,800 MWh (data from the Generation Information Bank of the Aneel, 2016). If in this region, for natural reasons, the wind speed were reduced, keeping the air density constant, we would have a reduction in the production of electricity. Indicate the region in question and what would be the amount of electrical energy produced if the wind speed was reduced by half.
a) Southern region; 3,900 MWh.
b) Northeast region; 1950 MWh.
c) Northeast region; 3,900 MWh.
d) Southern region; 1950 MWh.
More questionsWhen Djavan sings the verse “a good place to read a book” in the song “A cold day” it seems to imply that it is a good book. What is a good book? What is literature? What is the relationship between philosophy and literature? No, in this video I'm not going to answer these eternal and radical philosophical questions. Let's go further. We are going to talk about the various possibilities of a philosophical analysis of literature (or vice versa) in a video that is intended to be much more a chat than a class.
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