A gas undergoes isochoric heating, during which it gains 5470 J of heat and attains a pressure of 3.45 X 105 Pa. Following this, it experiences an isobaric compression that is also adiabatic, in which its volume decreases by 6.84 X 10-3 m3. Find the total change in the internal energy of the gas for this two-step process. Be sure to include the algebraic sign ( or -) of the total change in the internal energy.

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Which levels of government establish and implement educational requirements for minors