You need to say the right things to said character and you have to be nice to them and do their loyalty mission...
Yes, you can have a relationship with Jack.
cause and effect
Gravity is a force and its effect on a mass is measured in newtons.
Of course yes! Just think of the formula for density! Density=mass/volume! There is a direct relationship between density and mass (directly proportional)!
If he died in Mass Effect 1 then he is not in Mass Effect 2. If he survived Mass Effect 1 he shows up in Mass Effect 2 but he can not be killed.
No measurable effect at all. The electrons which cause the negative charge have such an unbelievably small mass that billions of them cannot make any observable change to the mass.
well the relationship between mass and force is..........*relationship... Force=mass x acceleration
Yes you can, it doesn't make a difference.
If you played Mass Effect 1 the second game imports your old game save, so it would depend on how you played Mass Effect 1 as to whether or not Kaiden is alive. If you did not play Mass Effect 1, then the game will default to the character with the opposite gender to Shepard. So Ashley will be there with a male Shepard, Kaiden for a female one. Below is a link which has the important decisions you make in 1 and their effect in the sequel.
The effect of mass extinction is extinction, death of a mass
Yes, there will be a Mass effect 3. even if your Shepard died, there will be a mass effect 3.
Jeff "Joker" Moreau is never really threatened or in need of "saving" in the Mass Effect series. This question does not really make sense.