Alightbulb has a power of 100 w. and is used for 4 hours. a microwave has a power of 1200 w and is used for 5 minutes.

a. how much energy is used by the lightbulb?

b. how much energy is used by the microwave?

c. the lightbulb has an efficiency of 1.8%. how much heat energy does the lightbulb produce in 4 hours?

a) E=Nt=100*(4*3600)=1440000 J

b) E=1200*(5*60)=360000 J

c) Q=E*(100-1.8)/100=1414080 J

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

the answer is to check all of them! they all apply well at least i think so!