An electric motor draws a current of 2.60 A from a 18.0-V battery when it runs at normal speed. If the motor's armature is "jammed" so that it cannot rotate, the current suddenly rises to 10.0 A. What is the back emf of the motor when running at normal speed?
a. 4.68 V
b. 10.0 V
c. 22.7 V
d. 13.3 V
e. 133 V
d
Physics & Space Science
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The number of stars in the Milky Way Galaxy is approximately
A) a few hundred. B) a few hundred thousand. C) a few hundred billion. D) a few hundred million.
Physics & Space Science
____ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence
a. The CNO cycle b. The proton-proton chain c. Hydrostatic equilibrium d. The neutrino process e. none of the above
Physics & Space Science
The special theory of relativity sets a limit on speed. Does it set a limit on momentum?
A) Yes B) No
Physics & Space Science
When a binary system loses orbital energy, it emits _______________ radiation
Fill in the blank(s) with correct word
Physics & Space Science