How many degrees in 5 minutes does a copper electric gun with a mass of 0.5, connected to a network
| September 23, 2021 | education
How many degrees in 5 minutes does a copper electric gun with a mass of 0.5, connected to a network with a voltage of 120 V at a current of 2.5 A? S = 380 J / kg s’
Given: t (operating time of the electric soldering iron) = 5 min or 300 s; m (mass of the electric soldering iron) = 0.5 kg; U (operating voltage in the network) = 120 V; I (current in a copper electric soldering iron) = 2.5 A.
Constants: according to the condition, we take C (specific heat capacity of copper) = 380 J / (kg * ºС).
1) The released amount of heat on the soldering iron: Q = U * I * t = 120 * 2.5 * 300 = 90,000 J.
2) Change in temperature of a copper soldering iron: Δt = Q / (C * m) = 90000 / (380 * 0.5) = 473.7 ºС.
Answer: The temperature will increase by 473.7 ºС.
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