When a substance is exposed to something that has a lower temperature,
a. work is done on it.
b. work is done by it.
c. heat is transferred from it.
d. heat is transferred to it.
e. none of the above.
c
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Which best describes the property of surface tension in the examples pictured here?
a. Neighboring molecules of the liquid bond to each other, forming a flexible atomic sheet at the surface. b. Molecules at the surface have different properties than atoms surrounded on all sides by other atoms. c. At a surface, the interaction between air molecules and the fluid create the surface tension. d. The surface tension pulls molecules out from the center of a liquid to the surface. e. The surface tension only occurs at high temperatures.
The most recent evidence from the use of Type Ia supernovae as standard candles says that
a) the universe is decelerating b) the universe is accelerating c) the universe is closed d) the cosmological constant is zero e) the universe is stationary
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. ?1.3 kJ b. ?1.5 kJ c. ?1.8 kJ d. ?2.0 kJ e. ?2.3 kJ
The concept of superposition implies that (choose the best answer)
1.when two waves that both have positive displacements cross each others' paths, the resulting wave will also have a positive displacement. 2.when two waves cross that are identical, except that one has a positive displacement and the other a negative displacement, they will cancel each other out at that point in space and time. 3.two traveling waves can pass through each other without being altered. 4.all of these are true.