What form of interplanetary debris did mankind discover first? Why?
What will be an ideal response?
Comets that come close to Earth and Sun can be imposing, and to the ancients, frightening objects with long tails, obvious to the naked eye. All asteroids are so distant telescopes are needed.
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In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?
A. 900 B. 700 C. 500 D. 300 E. 600
A disk of mass m moving in the positive x direction collides with a stationary disk, also of mass m. The first disk moves in a direction ?1 with respect to the x axis, and the second disk moves off in a direction of ?2 below the x axis, as shown in the figure
If v = 10 m/s, ?1 = 30°, and v1f = 8 m/s, what is v2f?
a.
6.9 m/s
b.
6.1 m/s
c.
2.0 m/s
d.
8.7 m/s
A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially perpendicular to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.
Which of the following best describes the web design concept of alignment?
A. A contrast between light and dark colors. B. The trend of using RWD to determine layout. C. The placement of objects in fixed or predetermined positions, rows, and columns. D. Meeting target audience expectations.