In noting that our world is "differentiated," we mean that
A) the density of its materials decreases as you go downward toward the core.
B) the Earth has evolved in a different pattern than any other planet.
C) the iron and nickel core is denser than the silicate mantle and crust.
D) radioactive heating in the core is at a slower pace than when the Earth was new.
E) the Earth's magnetic field is different now in polarity than it was 700,000 years ago.
C
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A CD has a diameter of 12.0 cm and is rotating at an angular velocity of 10.0 rad/sec. If the CD has a constant angular deceleration of -0.5 
then the angular velocity of the CD after 3.0 sec is
A. 5.7 rad/s. B. 6.2 rad/s. C. 7.9 rad/s. D. 8.5 rad/s. E. 9.8 rad/s.
Freely falling bodies experience
a. motion with constant velocity. b. motion with zero acceleration. c. motion with constant acceleration. d. motion at a constant speed. e. none of the above
Calculate the current through a 10.0-m long 22 gauge (having radius 0.321 mm) nichrome wire if it is connected to a 12.0-V battery
The resistivity of nichrome is 100 × 10-8 ? ? m. A) 776 mA B) 30.9 A C) 17.5 A D) 388 mA E) 61.8 A
One phenomenon that the geocentric models struggled to explain was ________.
A. retrograde motion B. sunspots C. the rotation of Earth D. parallax E. epicycles