An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
A) It is reduced by a factor of two.
B) It is reduced by a factor of four.
C) It increases by a factor of two.
D) It increases by a factor of four.
E) It doesn't change.
C
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Three identical 4.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 4.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
a. 16 N b. 32 N c. 24 N d. 19 N e. none of the above
Which statement about asteroids is not true?
A) Many, but not all, orbit the Sun in the asteroid belt. B) If we could put all the asteroids together, they would make an object about the size of Earth. C) Most asteroids are not spherical in shape. D) Some are more like loosely bound piles of rubble than solid chunks of rock.
Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of
A. 2 N exerted by the book on the hand. B. 10 N exerted by the Earth on the book. C. 10 N exerted by the book on the hand. D. 10 N exerted by the book on the Earth. E. 12 N exerted by the book on the hand.
The microstructure of the grains of solid ? and ? phases that form in the lead-tin eutectic reaction is _____________ of the ? and ? phases.
Fill in the blank(s) with the appropriate word(s).