Physics, 13.07.2019 18:20 22emilyl530
Neutrons and protons can momentarily “violate” conservation of energy by emitting and then quickly reabsorbing particles such as the neural pion (rest energy 135 mev).
a) considering p → p + π , how long can the pion exist, according to the uncertainty principle? (ignoring kinetic energy, use the pion rest energy as the “borrowed” energy, hence the uncertainty)
b) if the pion travels at approximately the speed of light, roughly how far from the proton could it get before it must be absorbed? this isn’t just a hypothetical exercise: the strong nuclear force can be understood as being mediated by the exchange of pions, and this calculation provides a reason why it is a shortrange force.
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Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?
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Compare the maximum rate of heat transfer to the basal metabolic rate by converting a bmr of 88 kcal/hr into watts. what is the value? from this comparison you should see why the body can accommodate a modes amount of activity in hot weather but strenuous activity would increase the metabolic rate above the body's ability to remove heat [12].
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