Which of these is the most likely impact of extensive mining of coal to produce energy? - pollution of atmosphere by harmful gases - increase in fertility of soil because of minerals - purification of underground water by natural minerals - increase in level of harmful radiation in the atmosphere stuck on this question and really can't figure it out! can someone or link me to some information?

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car

A200 g lead frying pan gains 2000 joules of heat. what is the change in temperature