Earth's interior at a depth of 3500 kilometers is believed to be 1 - liquid at a temperature of approximately 4900
2 - solid at a temperature of approximately 4900
3 - liquid at a temperature of approximately 5400
4 - solid at a temperature of approximately 5400

d. air pressure decreases as altitude increases.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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

not too sure thinking all accelerations are pointed down