I have a couple of science questions that I'm stuck on. Help..?
1. Describe how sound is created and gets to our ear for us to hear. Does sound need a medium to travel through?
2.What is wavelength? What does it tell us about the energy of a wave?
3.What is amplitude? What does it tell us about the energy of a wave?
4.What type of waves are light waves? Does light need a medium to travel through?

it has to be b, about 97 percent.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

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