The resultant moment vector MR at point O in Problem 2.2 is (in N?m)
(A) 12j 1 18k
(B) 215i 1 12k
(C) 18j 1 12k
(D) 212i 1 18j
(A) 12j 1 18k
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An collision occurs between object X and object Z. Object X has twice the mass of object Z. Which of the following quantities is NOT the same for the two objects?
A. Magnitude of change in momentum B. Magnitude of force felt by each C. Time of collision D. Magnitude of change in velocity
Stellar and galactic crowding: The comparison of objects' sizes to the distance between them gives a sense of their relative density, i.e., how "crowded" they are. A typical human is about 1 meter across the shoulders
Compare the relative density of people in the case where they are standing on average 1 meter apart compared to a situation where they are on average 10 meters apart (hint: describe the separation in units of person-size). Now, compare the "crowding" of stars to that of galaxies. A typical star has a diameter of about 1 million km, while the average space between stars is about 5 light-years. A typical spiral galaxy in a cluster (such as the Milky Way) is 100,000 light-years across, and has another spiral galaxy within about 10 million light years.
Composite particles that are composed of three quarks are called
A) bosons. B) baryons. C) leptons. D) hadrons. E) mesons.
The Cenozoic era consists of the Tertiary and ______________ periods
Fill in the blank(s) with correct word