A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly
A. Inward toward the center of the merry-go-round.
B. Outward away from the center of the merry-go-round.
C. In the direction of rotation.
D. Nowhere: the net force’s horizontal component is zero.
E. In some other direction (specify).
A. Inward toward the center of the merry-go-round.
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Components: Vector 
is along the +x-axis and vector 
is along the +y-axis. Which one of the following statements is correct with respect to these vectors?
A. The x component of vector 
is equal to the x component of vector 
.
B. The y component of vector 
is equal to the y component of vector 
.
C. The x component of vector 
is equal to the y component of vector 
.
D. The y component of vector 
is equal to the x component of vector 
.
Drew lifts a 60-kg crate onto a truck bed 1 meter high in 3 seconds. Connor lifts sixty 1-kg boxes onto the same truck in a time of 2 minutes. Which of the following statements is true?
(A) Drew does more work than Connor does. (B) Connor does more work than Drew does. (C) They do the same amount of work, but Drew operates at a higher power level. (D) They do the same amount of work, but Connor operates at a higher power level. (E) Drew and Connor do the same amount of work and operate at the same power level
As evidence for the cosmic inflation hypothesis, this hypothesis explains
A) the observed "flatness" of the overall three-dimensional universe. B) the origin of the "clumping" of matter and energy that we see today in such aggregations as stars and galaxies. C) Both of the above. D) the force of gravity. E) All of the above.
Air pollution results from ______________ combustion of ______________ fuels
Fill in the blank(s) with correct word