Walt made a study chart listing uses for two types of electromagnetic waves. which headings best complete the chart? a: infrared waves b: x-rays a: microwaves b: ultraviolet waves a: ultraviolet waves b: gamma rays a: x-rays b: radio waves

Velocity=total displacement/timefrom house to store is 500 from store to neighbor is 200 therefore total displacement=500+200=700metrestherefore,700metres/910seconds=0.8metres per second

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move. 

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.