What happens to a given mass of water as it is cooled from 4°C to zero?
a. expands
b. contracts
c. vaporizes
d. Neither expands, contracts, nor vaporizes.
A
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Two springs are hung from a ceiling and carry identical masses. The first spring has a spring constant twice as large as the second spring. The masses on each spring are pulled down from their equilibrium positions the same distance and are then released. The amplitude of the oscillation is
A. larger for the second spring. B. It is not possible to know which is larger without knowing the mass C. larger for the first spring. D. the same for both springs.
For a mixture of two different elements A and B, at one atmosphere of pressure three phases are in equilibrium (?, ?, and liquid), and it is desired to keep all three phases in equilibrium. Which of the following statements is true?
(a) If the temperature is changed, the composition of the ?, ?, and liquid phases changes. (b) The composition of the ? phase is changed by adding more A-type atoms. (c) The composition of the liquid phase is changed by adding more A-type atoms. (d) Nothing can be changed.
A shiny, spherical, metal alien jumps out of a perfectly good airplane and skydives for a few seconds. Its photographic friend snaps photos of the sphere with a special camera that also captures the forces on the object. Refer to the set of snapshots Q, J, Y, and L. Which snapshot depicts the forces just after the parachute has fully opened?
A. Snapshot Q B. Snapshot L C. Snapshot J D. Sapshot Y
The third-quarter Moon rises at noon
a. True b. False Indicate whether the statement is true or false