leslie1811
09.12.2020 •
Physics
39.
1+2+1+1
Answer the questions based on the given diagram of an electric
motor:
N
Spotrings
Pando
Brushes
candy
Simple atectric motor
i) Name two devices in which electric motors are used.
ii)What is the principle of an electric motor?
ii) What is the function of a split ring in an electric motor?
iv) How can the speed of rotation of an electric motor be increased?
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Ответ:
(a-b) *(a-b) *(a-b)
=(a*a*a) -3*(a*a*b)+3*(a*b*b)-(b*b*b)
34000*(1-7%)*(1-7%)*(1-7%)
=34000*(1-0.07)*(1-0.07)*(1-0.07)
=34000*[(1*1*1)-3*(1*1*0.07)+3*(1*0.07*0.07)-(0.07*0.07*0.07)]
=34000*(1-0.21+0.0147-0.000343)
=34000*(0.804357)
=34*1000*(804.357/1000)
=34*804.357
=27348.138
=27348