A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The moment of inertia of the rod about this axis is ML2/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 9.8 rad/s2
b. 7.4 rad/s2
c. 8.4 rad/s2
d. 5.9 rad/s2
e. 6.5 rad/s2
a
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What is the name for the period of time between one new Moon and the next?
What will be an ideal response?
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a. T Tauri stars b. Herbig-Haro objects c. O associations d. Bok Globule e. Giant molecular clouds
An alpha particle is:
a. any positively charged nucleus. c. a neutral helium atom. b. an X-ray. d. None of these choices.