The third step in the precipitation-hardening process is to _________ the alloy to form the precipitate.
Fill in the blank(s) with the appropriate word(s).
age or heat
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Slanting Surfaces With Friction: A 5.0-kg box slides on the surface on a ramp that rises at 37° above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60. What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?
What will be an ideal response?
What evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies B) observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies C) observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy D) the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies E) all of the above
Starting from rest, a car accelerates down a straight road with constant acceleration a1 for a time t1, then the acceleration is changed to a different constant value a2 for an additional time t2 . The total elapsed time is t1 + t2 . Can the equations of kinematics be used to find the total distance traveled?
a. No, because this is not a case of constant acceleration. b. Yes, use (a1 + a2)/2 as the average acceleration and the total time in the calculation. c. Yes, use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. d. Yes, break the problem up into 2 problems, one with the conditions for the first time interval and the other with the conditions for the second time interval, noting that for the second time interval the initial velocity is that from the end of the first time interval. When done, add the distances from each of the time intervals.
An object that has twice as much mass as another object also has twice as much
A) inertia. B) velocity. C) gravitational acceleration. D) volume. E) all of the above