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Introduction Are people unaffected by tax increase if they pay zero in taxes afterwards? No, consumption may have changed in response to the tax increase Bundle consumed is less desirable Excess burden is a loss of welfare above and beyond the tax revenues collected
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In this lecture, we consider the problem of a body in which the mass of the body changes during the motion, that is, m is a function of t, i.e. m(t). Although there are many cases for which this particular model is applicable, one of obvious importance to us are rockets. We shall see that a significant fraction of the mass of a rocket is the fuel, which is expelled during flight at a high velocity and thus, provides the propulsive force for the rocket
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In this lecture, we will consider how to transfer from one orbit, or trajectory, to another. One of the assumptions that we shall make is that the velocity changes of the spacecraft, due to the propulsive effects, occur instantaneously. Although it obviously takes some time for the spacecraft to accelerate to the velocity of the new orbit, this assumption is reasonable when the burn time of the rocket is much smaller than the period of the orbit. In such cases, the Av required to do the maneuver is simply the difference between the
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件(1)
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件(3)
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件(8)
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件(4)
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外研版(三起)(2012)小学英语三年级下册Module 8 Unit 2 Daming flies a kite in the park.课件(2)
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Inertial reference frames In the previous lecture, we derived an expression that related the accelerations observed using two reference frames, A and B, which are in relative motion with respect to each other. aA =aB+(aA/ B)'y'' 22 x (DA/ B) 'y'2'+ TA/B+ X TA/B). (1) Here, aA is the acceleration of particle A observed by one observer, and
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