Is the sub-story a reasonable “split” for the user story in the following scenario? Which option correctly identifies why or why not? User story: As a first-time user, I want to purchase organic jams as gifts to send to friends.

Sub-story: As a first-time user, I want to add organic jams to my shopping cart.

It is; the user defines how and why he or she wants to purchase organic jams.

It is not; the cost of jams the user wants to buy needs to be specified.

It is not; what types of jams the user wants to buy needs to be specified.

It is; the first step in making an online purchase is to add an item to the “shopping cart.”

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.