7. a) Calculate the acceleration of a 2000 kg single-engine airplane just before takeoff when the thrust of the engine is 500 N. b) Assuming a
constant acceleration of 0.25 m/s^2, how long would it take to attain a
speed of 45 m/s at which speed it could liftoff? c). Assuming the plane
started from rest, how far would the plane accelerating at 0.25 m/s^2
after 20 seconds. *

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

what is the question because that is not a question.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide