CP BIO Struck by Lightning. Lightning strikes can involve currents as high as 25,000 A that last for about 40 µ s. If a person is struck by a bolt of lightning with these properties, the current will pass through his body. We shall assume that his mass is 75 kg, that he is wet (after all. lie is in a rainstorm) and therefore has a resistance of 1.0 kΩ, and that his body is all water (which is reasonable for a rough, but plausible, approximation), (a) By how many degrees Celsius would this lightning bolt increase the temperature of 75 kg of water? (b) Given that the internal body temperature is about 37°C, would the persons temperature actually increase that much? Why not? What would happen first?
CP BIO Struck by Lightning. Lightning strikes can involve currents as high as 25,000 A that last for about 40 µ s. If a person is struck by a bolt of lightning with these properties, the current will pass through his body. We shall assume that his mass is 75 kg, that he is wet (after all. lie is in a rainstorm) and therefore has a resistance of 1.0 kΩ, and that his body is all water (which is reasonable for a rough, but plausible, approximation), (a) By how many degrees Celsius would this lightning bolt increase the temperature of 75 kg of water? (b) Given that the internal body temperature is about 37°C, would the persons temperature actually increase that much? Why not? What would happen first?
CP BIO Struck by Lightning. Lightning strikes can involve currents as high as 25,000 A that last for about 40 µs. If a person is struck by a bolt of lightning with these properties, the current will pass through his body. We shall assume that his mass is 75 kg, that he is wet (after all. lie is in a rainstorm) and therefore has a resistance of 1.0 kΩ, and that his body is all water (which is reasonable for a rough, but plausible, approximation), (a) By how many degrees Celsius would this lightning bolt increase the temperature of 75 kg of water? (b) Given that the internal body temperature is about 37°C, would the persons temperature actually increase that much? Why not? What would happen first?
A heart defibrillator is used to enable the heart
to start beating if it has stopped. This is done
by passing a large current of 1 A through the
body at 10 V for a very short time, usually
about 6 ms. How much energy is transferred in
mJ?
A beam of protons is moving toward a target in a particle accelerator. This beam constitutes a current whose value is 0.40 mA with a potential difference of 35 kV. The target is an 18-gram block of copper, which is bombarded by these protons for 24 seconds. What is the change in temperature of the block of copper? Copper has a specific heat capacity of 385 J/(kg·°C).
a)What energy (in J) is dissipated by a lightning bolt having a 17,300 A current, a voltage of 1.40 ✕ 102 MV, and a length of 1.00 ms?
J
(b)What mass (in kg) of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
Chapter 25 Solutions
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