If an iron-0.77 % C steel is very rapidly cooled from 800°C to room temperature, the expected microstructure is described as _____________.
Fill in the blank(s) with the appropriate word(s).
martensite
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The orbit of Comet UX209 about the Sun is not a circle but it orbits once every 365 days, just as Earth does. UX209 is closer to the Sun in April than it is in October. Thus, the speed of UX209 as it moves along its orbit is
A. steadily decreasing all year long. B. steadily increasing all year long. C. greater in October than it is in April. D. greater in April than in October. E. the same all year long.
A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is
a. 0.5 s. b. 2 s. c. 5 s. d. 10 s. e. not determinable.
A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal
(a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane. (c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?
What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365 B. 4.860 C. 5.250 D. 3.375