B. because physical changes are always reversal
"Non nobis Domine, non nobis, sed Nomini tuo da gloriam."
Regards M.Y.
Answer:
2.62seconds
Explanation:
Speed is defined as the ratio of the distance covered by a body with respect to time.
Speed v = Distance (s)/Time (t)
For a traveling sound wave, the distance between the source of a sound and the reflector is '2S'.
Speed v = 2 × distance (S)/Time (T)
V = 2S/t
2S = vt
Given speed of the wave = 342m/s
Distance covered = 450m
t = 2S/v
t = (2×450)/343
t = 900/343
t = 2.62seconds
It will take him 2.62seconds for him to hear his own voice echo off of the wall.
It’s (A) I’m not really sure
Answer:
the answers the correct one is case B. The field decreases the external field
Explanation:
We place the bar in an area of space with an electric field, generated by a series of positive and negative charges. Negative charges inside the bar are attracted by positive charges, and positive charges are attracted by negative external charges. As the electric field has direction of the positive charges towards the negative ones the field inside the bar is contrary to the external field
When reviewing the answers the correct one is case B. The field decreases the external field
E_net = E_ext - E_int
The answer for getting and using every,reproducing and maintaining structure are out of life