A rigid object is rotating with an angular speed w > 0. The angular velocity vector w and the angular acceleration vector a are anti-parallel. The angular speed of the rigid object is
1.clockwise and increasing.
2.clockwise and decreasing.
3.counterclockwise and increasing.
4.counterclockwise and decreasing.
4
Physics & Space Science
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Which of the following is a unit of energy:
a. watt b. ft—lb/sec c. newton/sec. d. horsepower e. joule
Physics & Space Science
What is the change in entropy when 1 kg of ice melts at 0°C is (in J/K)? (LF,ice = 333 J/g.)
a. 335. b. 603. c. 1220. d. 1310. e. 2160.
Physics & Space Science
As the principal quantum number of the Hydrogen atom increases, what does the spacing between adjacent energy levels do?
A. Decreases B. Increases C. Stays the same
Physics & Space Science
The first plants probably evolved from
A) plankton B) algae C) corals D) seaweed
Physics & Space Science