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A 120-V motor has mechanical power output of 3.20 hp. It is 91.0% efficient in converting power that it takes in by electrical transmission into mechanical power.
(a) Find the current in the motor.
A
(b) Find the energy delivered to the motor by electrical transmission in 3.40 h of operation.
MJ
(c) If the electric company charges $0.110/kWh, what does it cost to run the motor for 3.40 h?
The highest theoretical efficiency of a gasoline engine, based on the Carnot cycle, is 0.300 or 30.0%. If the heat engine absorbs 812 J of energy from the hot reservoir during each cycle, how much work can it perform in each cycle
(1) A circular wheel has a radius R = 0.45 + or - 0.02 m. The wheel is observed to be rotating uniformly with period T = 2.00 +or- 0.05 s. (i) Compute the frequency with which the wheel spins (ii) Compute the angular speed of the wheel. (iii) Comp..
A 9.58-m ladder with a mass of 22.2 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 264 N. What is the net torque acting on the ladder
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The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.209 m and mass 4.51 kg, what should the radius of the disk be
A long, straight wire carrying a current of 5.00 A is placed along the axis of a cylinder of radius 0.500 m and a length of 5.00 m
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The three resistors are identical with R1 = R2 = R3= 160 ?, and the battery voltage is 50 V. What is the current through resistor R2? R2 and R3 are parallel so these need to be treated with R1 as Requiv = R1+ (R2*R3)/R2+R3 but don't know where to ..
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