This is for criminal law:
jerry walks up to jill, a former girlfriend, and tells her, "tomorrow when i get my paycheck, i'm going to buy a gun and kill you." jill immediately gets a gun out of her car and kills jerry. jill: claims she killed in self-defense.
1. is this a valid self-defense?
2. why or why not?

How much work would a child do while puling a 12-kg wagon a distance of 3m with a 22 n force directed 30 degrees with respect to the horizontal? (a) 82j (b) 52j (c) 109j (d) 95j

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?