Consider an object floating on a pool of water. Suppose much oil is poured onto the water and now floats above the water, with the object floating with part surrounded by a layer of oil and the lower part still in water
How has the buoyant force on the object changed by the oil layer? A) decreased
B) remained the same
C) increased
B
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Constant Acceleration Kinematics: Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with a uniform forward acceleration of 2.40 m/s2. How long after car A begins to accelerate does it take car A to overtake car B?
A. 5.50 s B. 12.6 s C. 19.0 s D. 316 s E. Car A never overtakes car B.
Carnot Engine: An ideal Carnot heat engine operates between 285 K and 460 K. What is its efficiency?
A. 0.38 B. 0.62 C. 0.61 D. 1.61
As a block slides down a frictionless incline, which of the following statements is true?
a. Both its speed and acceleration increase. b. Its speed increases and its acceleration remains constant. c. Its speed and acceleration remain constant. d. Its speed increases and its acceleration decreases. Both its speed and acceleration decrease.
A ferromagnetic material is magnetized by the alignment of
a. domains. b. atoms. c. single magnetic dipoles. d. poles.