Isolated quarks were first observed in
A. 1938.
B. 1955.
C. 1976.
D. 2001.
E. Isolated quarks have not been observed.
E. Isolated quarks have not been observed.
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Astronomers can measure the diameter of our Milky Way Galaxy by plotting the position of globular star clusters.
Answer the following statement true (T) or false (F)
An acoustical engineer in designing a music hall is concerned with
A) echoes. B) reflection. C) reverberations. D) all of the above E) none of the above
The light from a distant star is shifted such that the peak of its spectrum, at 620 nm, is shifted to 635 nm. What is its radial velocity relative to Earth?
A. -0.11c B. -0.024c C. -0.15c D. -0.012c
Two spheres are made of wood – the first is of a variety of wood whose density is equal to that of water, while the second is of a variety whose density is greater than that of water. These spheres have the same volume – and the first remains wherever it is placed in the water, so it is effectively suspended m in mid-water. The second rests on the bottom, being more dense than water. Compare the buoyant forces on the two spheres.
A. Nothing specifically can be concluded without knowing exactly the densities of the spheres. B. They are identical C. The force on the second is zero, and therefore less than that on the first, which is non-zero. D. The force on the second is non-zero and is less than that on the first.