A battery of emf 24 V is connected to a 6.0−Ω resistor. As a result, current of 3.0 A exists in the resistor. The rate at which energy is being dissipated in the battery is: 3.0 W 6.0 W 18 W 54 W 72 W
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A battery of emf is connected to a resistor. As a result, current of 3.0 A exists in the resistor. The rate at which energy is being dissipated in the battery is:
3.0 W
6.0 W
![A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a gun with a 1.60 kg barrel made of iron [specific heat = 448 J/(kg⋅∘C)]. The gun fires a 3.40 g bullet that exits the barrel with a speed of 340 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in ∘C)? (Round your answer to at least one decimal place.) ∘C](https://www.doubtrix.com/uploads/editor/3573972417MJHpmUZauf.png)