Which nucleus would be least likely to undergo radioactive decay?
A. A nucleus whose total mass is less than the sum of the masses of its individual particles
B. A nucleus whose total mass is greater that the sum of the masses of its individual particles
C. A nucleus with a mass that is less that the mass of an iron nucleus
D. A nucleus whose mass is equal to the sum of the masses of its individual particles

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.