In order to develop good sleep hygiene, one should strive to do all of the following except a. exercise right before bed b. avoid caffeine before bedtime c. avoid food at least an hour before sleep d. establish a sleep-friendly environment

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

What is the equation for electrical work?

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules