If a liter of water is heated from 20 c to 50 c, what happens to its volume? a. the volume decreases. b. the volume increases. c. the volume first increases, then decreases. d. the volume first decreases, then increases, select the best answer from the choices provided

The volume increases

Choice B is correct

Explanation:

If a liter of water is heated from 20 C to 50 C its volume will increase.

Matter exists in 3 states;

Solids

Liquids

Gases

Matter expands when heated, consequently occupying more space. This implies that volume will increase

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