The look-back time for the fictional stars Chairos, Alpha Arctic, Chi Omega, and Delta Junos are 37 years, 32 years, 29 years, and 41 years respectively. From this information, we can conclude that the nearest star is _____
A) Chairos
B) Alpha Arctic
C) Chi Omega
D) Delta Junos
B
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A 1.10-kg wrench is acting on a nut trying to turn it. The length of the wrench lies directly to the east of the nut. A force 150.0 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east
What is the magnitude of the torque about the center of the nut? A) 22.5 N ? m B) 11.3 N ? m C) 19.5 N ? m D) 2250 N ? m E) 1949 N ? m
An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The length of this object as measured by a stationary observer
A) approaches infinity. B) approaches zero. C) increases slightly. D) does not change.
Which of the following is not expected to provide solid-solution strengthening?
(a) A large substitutional atom in the tensile strain region of an edge dislocation. (b) A small substitutional atom in the compressive strain region of an edge dislocation. (c) A small interstitial atom in the compressive strain region of an edge dislocation. (d) A small interstitial atom in the tensile region of an edge dislocation.
Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?
A) A B) B C) C D) D