Linear momentum
a. has the units of mass times acceleration.
b. has magnitude and direction.
c. is a scalar quantity.
d. none of these
b
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In the _________technique the specimen is in a fixed position relative the x-ray beam and diffraction of continuous radiation occurs when Bragg’s law is satisfied.
Fill in the blank(s) with the appropriate word(s).
PEEK, along with other polymers, such as PPE, PEK, PSU, and PES, is a highperformance _________polymer.
Fill in the blank(s) with the appropriate word(s).
Interstellar gas clouds may collapse to form stars if they
a. have very high temperatures. b. encounter a shock wave. c. rotate rapidly. d. are located near main sequence spectral type K and M stars. e. All of the other choices are correct.
Plutonium has a half life of 2.4 × 104 years. How long does it take for 99% of the plutonium to decay?
A) 1.6 × 106 y B) 1.6 × 105 y C) 1.6 × 104 y D) 1.6 × 103 y E) 1.6 × 102 y