Answer:
A
Explanation:
When coal is burned it releases many harmful chemicals into the air, such as methane (greenhouse gas) and contributes to global warming
Explanation:
It took
for the sound to reach the 1st wall and at the same time time, the same sound took
to reach the 2nd wall. Assuming that the sound travels at 343 m/s, then let
be the distance of the person to the 1st wall and
be the distance to the 2nd wall. So the distance between the walls X is


Answer:
The electric field points to the left because the force on a negative charge is opposite to the direction of the field.
Explanation:
In an electric field, a positive charge has tendency to move from high to low potential and hence experience the electric force in the direction of electric field since electric field lines are directed from high to low potential.
In an electric field, a negative charge has tendency to move from low to high potential and hence experience the electric force in the direction opposite to electric field since electric field lines are directed from high to low potential.This phenomenon happened because The electric field from a positive charge will points away from the charge while the electric field from a negative charge will points toward the charge.