While a balloon is being filled, if the temperature of the air in the balloon decreases, what happens to its volume?

It decreases

Explanation:

Charle's Law: This law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.

    (At constant pressure and number of moles)

where,

= initial volume of gas  

= final volume of gas

= initial temperature of gas

= final temperature of gas

Therefore, as volume and temperature are proportional, if the temperature of the air in the balloon decreases,  its volume also decreases.

answer: good job it's all correct !

explanation:

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s