A recovery _________is when a strain-hardened metal is heated to an elevated temperature and the ductility is increased, but no new grains form.
Fill in the blank(s) with the appropriate word(s).
anneal
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A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The rotational inertia of the rod about the pin is 2.0 kg/m2.)
a. 3.5 rad/s b. 2.7 rad/s c. 3.1 rad/s d. 2.3 rad/s e. 1.6 rad/s
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.
Star clusters are important to our study of stars because
a. all stars formed in star clusters. b. the sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. all of the above
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500-Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
A. 0 B. 15 C. 29 D. 63 E. 250