Which of the following most likely has a fixed shape. helium gas, solid iron, liquid octane, hydrogen plasma

Option (b) is the correct answer.

Explanation:

An object whose molecules are attached together by strong force of attraction will most likely to have definite shape. This type of object is known as a solid object.

Whereas an object in which molecules are held less tightly is defined as a liquid. On the other hand, an object whose molecules are loosely held by weak vander waal forces is known as a gas.

Thus, we can conclude that out of the given options, solid iron will most likely has a fixed shape.

no simpler subs form complex ones. synthesise = make

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