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AnnyKZ [126]
3 years ago
8

Finish this equation useing the term "average speed" and "time interval ": total distance =

Physics
2 answers:
Natasha2012 [34]3 years ago
8 0

Total distance during the time interval  = 

         (average speed during the time interval)
times
         (length of the time interval) . 
enyata [817]3 years ago
8 0
It's speed equals ( distance Divided by time ) I hope this helps
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A 120-V motor has mechanical power output of 2.10 hp. It is 80.0% efficient in convertingpower that it takes in by electrical tr
creativ13 [48]

Answer:

a) 16.3 A

b) 17.6 MJ

c) $0.78

Explanation:

The mechanical power is watts is given by:

P_m=2.10hp*\frac{745.7W}{1hp}=1566W

The mechanical power is 80% of the electrical power so:

P_e=\frac{P_m}{0.8}=\frac{1566W}{0.8}=1958W

The electrical power in the motor is given by:

P_e=V*I\\where:\\V=voltage\\I=current

so the current in the motor is:

I=\frac{P_e}{V}\\\\I=\frac{1958W}{120V}=16.3A

Watt is equivalent to J/s, so the energy is given by:

E_m=P_e*t\\E_m=1958W*2.50h*\frac{3600s}{1h}=17.6MJ

The total cost is given by:

T_{cost}=0.160\frac{\$}{kW.h}*1.958kW*2.50h=\$0.78

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