The earth is not a uniform sphere but has regions of varying density. consider a simple model of the earth divided into three regions—inner core, outer core, and mantle. each region is taken to have a unique constant density (the average density of that region in the real earth):
a. use this model to predict the average density of the entire earth.
b. the measured radius of the earth is 6371km and its mass is 5.974*1024kg use this data to determine the actual average density of the earth.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Both independent and dependent clauses

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)