Which of the following statements is true of absolute zero?
A) It is equivalent to zero degrees Celsius.
B) It is the temperature at which an object contains no thermal energy that can be extracted.
C) It is the temperature at which water freezes.
D) It is the highest temperature at which the motion of particles is maximum.
B
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The density of ice is about 900 kg/m3, and the density of water is about 1000 kg/m3. A cubic block of ice one meter on a side floats in water. Assuming that the lowest square face of the cube is horizontal, the height of the block above the water line is
A. 0.2 m. B. 0.9 m. C. 0.5 m. D. 0.8 m. E. 0.1 m.
Write the equation of a wave, traveling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec
a. y = 0.02 sin [880?(x/330 ? t)] b. y = 0.02 cos [880? x/330 ? 440t] c. y = 0.02 sin [880?(x/330 + t)] d. y = 0.02 sin [2?(x/330 + 440t)] e. y = 0.02 cos [2?(x/330 + 440t)]
The additional energy given off by active galaxies is because of their higher stellar density
Indicate whether the statement is true or false
Normal galaxies in the present never went through an active galaxy phase
a. True b. False Indicate whether the statement is true or false