Two equal magnitude forces are in opposite directions, and their lines of action are separated by distance d. These two forces are applied to a solid disk, which is mounted on a frictionless axle. If d is half the radius r of the disk, which of the following positions for the forces would give the most torque?
a. One force on a line touching the circumference of the disk and the other on a line halfway to the center.
b. One force on a line at a distance d from the center and the other on a line through the center of the disk.
c. One force on a line at a distance d/2 from the center of the disk and the other on a line at a distance d/2 on the opposite side of the center of the disk.
d. Since all the above orientations give the same torque, choose this answer.
D
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Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct?
?
A. A has the greatest speed and the greatest acceleration. B. C has decreasing speed. C. D slows down and then speeds up. D. D speeds up and then slows down. E. E has a greater speed than A.
In a polyethylene long-chain molecule, the carbon-carbon and hydrogen-carbon bonds are all ______________bonds.
Fill in the blank(s) with the appropriate word(s).
Why did the solar nebula flatten into a disk?
A) The interstellar cloud from which the solar nebula formed was originally somewhat flat. B) The force of gravity from the Sun pulled the material downward into a flat disk. C) As the nebula cooled, the gas and dust settled onto a disk. D) It flattened as a consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones. E) The force of gravity from the planets pulled the material downward into a flat disk.
The emissivity of an ideal reflector has which of the following values?
a. 0 c. 100 b. 1 d. infinity