Contrast meteoroids and asteroids
What will be an ideal response?
Meteoroids are small debris scattered throughout the solar system, not detected until they hit our atmosphere and burn up as meteors or strike the ground and are recovered as meteorites. Asteroids are large enough to be telescopically detected and tracked; most of them lie between the orbits of Mars and Jupiter, but some pass close to us as well.
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A long thin rod of length L has a linear density ?(x) = Ax where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?
What will be an ideal response?
Starting from very far away, an object is moved closer and closer to a concave lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)
A) The image gets closer and closer to the lens. B) The image gets farther and farther from the lens. C) The image always remains virtual. D) The image eventually changes from real to virtual. E) The image keeps getting larger and larger.
As sediments accumulate, compaction and cementation produce sedimentary rock. This process is called
A) consolidation. B) solidification. C) lithification. D) solifluction.
A hole in a brass plate has a diameter of 1.200 cm at 20°C. What is the diameter of the hole when the plate is heated to 220°C? The coefficient of linear thermal expansion for brass is 19 × 10-6 K-1
A) 1.195 cm B) 1.200 cm C) 1.205 cm D) 1.210 cm