__________is a number between 1 and 0 that describes the shape of an ellipse
A) Acceleration
B) Momentum
C) Mass
D) Eccentricity
D
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A engine goes through a cyclic process. During the cyclic process the engine takes in 3200 J of heat and has a heat output of 2400 J. What is the efficiency of the engine?
A. 10% B. 15% C. 25% D. 40% E. 52%
As a leaf grows, it becomes more organized. Does this process violate the law of entropy?
A) Yes; in fact, it is known that the law of entropy does not apply to biological processes such as the growth of a leaf, or biological evolution. B) No, because total energy is conserved in this process, despite the increased organization of the leaf. C) No, because the radiation passing through the leaf during this process increases its entropy, so that the total entropy increases. D) No, because the O2 that is emitted during photosynthesis has greatly increased entropy, resulting in an overall increase of the total entropy. E) No, because the sugars and other molecules of the leaf are formed at a high temperature, resulting in an overall increase of the total entropy.
In a supermarket, you place a 22.3-N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the spring constant of the spring of the scale?
A) 650 N/m B) 600 N/m C) 330 N/m D) 820 N/m E) 410 N/m
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.