Find the total change in the internal energy of a gas that is subjected to the following two-step process. in the first step the gas is made to go through isochoric heating until 5460 j of heat is transferred into the gas and its pressure is 3.72 ✕ 105 pa. in the second step it is subjected to isobaric compression until its volume decreases by 7.50 ✕ 10−3 m3 and 1220 j of heat is transferred out of the gas. what is the total change in internal energy of this j?

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.