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.
One phenomenon that the geocentric models struggled to explain was ________.
A. retrograde motion B. sunspots C. the rotation of Earth D. parallax E. epicycles
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