A 80. volt DC motor draws 4.0 A at its operating speed of 1500. rpm with an armature resistance of 4.0 ?
(a) What is the starting current?
(b) What is the back emf when running normally?
(c) What series resistance could be added to limit the starting current to 10. A?
(a) 20. A
(b) 64. volts
(c) 4.0 Ω
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You roll a ball off a table and at the same time drop a second ball straight down from the edge of table. The second ball reaches the ground ____________ the first ball reaches the ground
a. before b. at the same time that c. after d. before or after, depending on the masses, e. cannot be determined
A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, what is the person's power output?
A whitish sky is evidence that the atmosphere contains
A) predominantly small particles. B) predominantly large particles. C) a mixture of particle sizes. D) water vapor. E) pollutants.
The probability that the energy to create a vacancy in a crystal is present in excess of the average energy in the crystal is given by the _____________ probability distribution.
Fill in the blank(s) with the appropriate word(s).