Regional metamorphic rocks are distinguished from igneous rocks because
A) they are finer grained.
B) regionally metamorphosed rocks are foliated and igneous rocks are not.
C) igneous rocks have interlocking grains and metamorphic rocks do not.
D) metamorphic rocks often have a "baked zone" and igneous rocks do not.
Answer: B
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When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
A. can be increased by shifting mass out away from the axis of rotation. B. can be decreased by shifting mass out away from the axis of rotation. C. can be increased by shifting mass in toward the axis of rotation. D. can be decreased by shifting mass in toward the axis of rotation. E. cannot be changed except by friction at the point of contact.
A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg- and her angular speed increases to 4.0 rev/s
Determine her initial moment of inertia.
Astronomers measure distances across the sky as _____
A) angles expressed in units of degrees and subdivisions of degrees B) volume expressed in units of gallons and pints C) energy expressed in units of calories and joules D) length expressed in units of miles and yards
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg×m2 b. 3.6 kg×m2 c. 3.1 kg×m2 d. 4.1 kg×m2 e. 1.6 kg×m2