What is true about all forces?
a. They are unbalanced
b. They involve more than one object
c. They cause objects to move
d. They cancel each other out

Pls answer pls I need this for a test today

B. They involve more then one object.

Explanation:

I learned about it and found the answer.

the answer for sodium is 0.186

the answer for rubidium is 0.251

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml