Aspool of thin wire (with inner radius r = 0.45 m, outer radius r = 0.60 m, and moment of inertia icm = 0.8208 kg·m2) pivots on a shaft. the wire is pulled down by a mass m = 1.300 kg. after falling a distance d = 0.500 m, starting from rest, the mass has a speed of v = 63.1 cm/s. calculate the energy lost to friction during that time.

The discovery of the electron as a subatomic particle was a result of

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)