The windings of a DC motor have a resistance of 6.0 ?. The motor operates on 120. V AC, and when running at full speed it generates a back emf of 105. V

(a) What is the starting current of the motor?
(b) What current does the motor draw when operating at full speed?


(a) 20 A
(b) 2.5 A

Physics & Space Science

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____________________ is the molecule most responsible for the greenhouse effect on Venus and Earth

Fill in the blank(s) with correct word

Physics & Space Science

Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points directly away from the nearest point on the y axis and has a magnitude that depends only on r, the distance to that nearest point. For which of the gaussian surfaces listed, would it be easiest to calculate the net flux of the electric field through that surface?

A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.

Physics & Space Science

A radioisotope has a half-life of ? at a temperature of 150 K. If its temperature is increased to 300 K, what will its half-life be?

A) 4? B) 2 ? C) ? D) ?/2 E) ?/4

Physics & Space Science

The materials within polar stratospheric clouds cause ozone to be destroyed through their presence

What will be an ideal response?

Physics & Space Science