Answer:
C
Explanation:Three methods of controlling the speed of a universal electric motor are: the resistance control method-which involved varying the voltage using semicoinductor devices,
the field tapping method, and the centrifugal switch method. In the resistance control method.
Answer:
attached below
Explanation:
Cylindrical steel rod : diameter ( D ) , length L, uniform temperature T
Initial temp of water : To, heat transfer coefficient between steel rod surface and water : h1
<u>The energy balance equation can be written as :</u>
Rate of convectional heat loss = Rate of decrease in internal energy with respect to time
cp = heat capacity of body, v = volume , р = density of body
attached below is the heat transfer differential equation and boundary and initial conditions
Answer:
1- 10.83 m/s
2- 48.86 m/s²
Explanation:
See the picture for explanation.
Answer:
69.62
Explanation:
The calculation of this question is as below:-
Consumption: 187W
Everyday operates: 17hours
cost of electricity: 0.06 per kWh
so, the annual operating cost
= Consumption ÷ kWh × Everyday operates × cost of electricity × total number of days in a year
Annual operating cost = 187W ÷ 1000 × 17h × 0.06 × 365 days
= 69.62