Physics: Aresistance is added in parallel to a 470 ω resistance to give an effective resistance of 330 ω. what is the approximate value of the added resistance? a) 140 ω b) 680 ω c) 1.1 kω d) 1.8 kω

Aresistance is added in parallel to a 470 ω resistance

Ответ:

jakeSanT5737

14.03.2023

Physics

26.6C

Explanation:

Using an energy balance:

Decrease in internal energy of casting must lead to an increase in internal energy of the tank and water, assuming that no heat flows out of the tank - perfectly insulated.

$m_{casting}*C_{p,casting}*(T_{casting} - T_{final})= m_{water}*C_{p,water}*(T_{final} - T_{water}) + m_{tank}*C_{p,tank}*(T_{final} - T_{tank})$

$2*0.5*(500 - T_{final})= 70*4.18*(T_{final} - 25) + 5*0.5*(T_{final} - 25)\\\\(1+2.5+292.6)*T_{final} = 500+7315+62.5\\\\T_{final} = 26.6C$

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Aresistance is added in parallel to a 470 ω resistance to give an effective resistance of 330 ω. what is the approximate value of the added resistance? a) 140 ω b) 680 ω c) 1.1 kω d) 1.8 kω

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