which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasma's?

a. particles move independently of one another and are widely spaced.
b. particle kinetic energy increases with increasing temperature.
c. particles exert no attractive or repulsive force on one another.
d. particles always move even when they have fixed positions.

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Me to solve all the questions on the sheet attached

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?