The starting current in a DC motor is 20. A, but it normally operates on 110. volts with a back EMF of 90. volts
(a) What is the resistance in the windings?
(b) What is the current at normal load?
(a) 5.5 ohms
(b) 3.6 Amperes
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The meteorites that strike Earth are:
A) pieces of comets that fall to Earth. B) mostly made of iron. C) the oldest rocks known. D) the remains of the planet between Mars and Jupiter. E) material from outside our solar system.
When the reflection of an object is seen in a plane mirror, the distance from the mirror to the image depends on
a. the wavelength of light used for viewing. b. the distance from the object to the mirror. c. the distance of both the observer and the object to the mirror. d. the size of the object.
What shows directly that there is a nuclear force?
a. The fact that electrons congregate around the nucleus. b. The fact that nuclei can lose nucleons. c. The relatively large mass of protons and neutrons compared to the electrons. d. The fact that electrons can change shells around the nucleus. e. The fact that so many nuclei are stable and hold together despite the repulsion between their positive charges.
What did the IAU establish in 1928? a. The IAU classified Pluto as a dwarf planet
b. The IAU published official names of all constellations. c. The IAU recorded 88 constellations with defined boundaries. d. The IAU recognized additional orbiting bodies in the Kuiper Belt. e. The IAU recorded all the mythologies associated with 88 constellations.