Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field B. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.Answer: D
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A(n) ____________________ universe is infinite and would have a density equal to the critical density
Fill in the blank(s) with correct word
Why do some quasars have redshifts greater than 1?
A) They are made of different elements than any other objects in the universe. B) They are very distant, with relativistic redshifts that take into account dilation of space-time, as Einstein predicted. C) They are made of tachyons and thus are able to move away from us faster than the speed of light. D) Einstein proved it is impossible to have a redshift greater than 1; these are all due to gravitational lensing tricking us. E) They are moving towards us, which throws off our spectrometers.
Suppose Mars had turned out to be significantly smaller than its current size, say about the size of our Moon. How would this have affected the number of geological features due to each of the four major geological processes?
What will be an ideal response?
Refer to Figure 6-13. Block A has a mass of 6.00 kg, block B has a mass of 4.00 kg and block C has a mass of 3.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A. 2.74 m/s2 B. 0 m/s2 C. 1.97 m/s2 D. 2.26 m/s2 E. 0.981 m/s2