You whirl a 2 kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is
a. 2 N
b. 4 N
c. 8 N
d. 16 N
e. 32 N
E
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Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. The required ratio of the applied forces P1/P2 so that joint B rotations ?B1 and ?B2 are equal is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
What key event took place during the atomic epoch?
A) The universe expanded and cooled enough to allow the first particles to appear. B) The universe expanded and cooled enough for electrons to orbit protons. C) The neutrinos were created. D) Atoms in the universe collected to form stars and galaxies. E) The universe underwent a brief period of rapid expansion.
If dark matter were to be found on this planet it would likely be
A) high in our atmosphere. B) within our oceans. C) within Earth's mantle. D) at the center of Earth's core.
Claudius Ptolemy created an elaborate geometrical and mathematical model to explain details of the observed motions of the planets while assuming:
A) Earth was motionless at the center of the Universe. B) the Sun was at the center of the Universe. C) Earth was part of a galaxy. D) there were many galaxies in the Universe.