Agarage door opener has a power rating of 350 watts. if the door is in operation for 30 seconds, how many joules of energy are used? (hint: remember that 1 watt = 1 joule/sec)

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction