If you jump straight up while inside a fast-moving train that gains speed, you land
A) slightly ahead of your original position.
B) at your original position.
C) slightly behind your original position.
Answer: C
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Why are the inner planets made of denser materials than the outer planets?
A) The Sun's gravity pulled denser materials toward the inner part of the solar nebula, while lighter gases escaped more easily. B) Denser materials were heavier and sank to the center of the nebula. C) In the inner part of the nebula only metals and rocks were able to condense because of the high temperatures, whereas hydrogen compounds, although more abundant, were only able to condense in the cooler outer regions. D) When the solar nebula formed a disk, materials naturally segregated into bands, and in our particular solar system the denser materials settled nearer the Sun while lighter materials are found in the outer part. E) In the beginning, when the protoplanetary disk was spinning faster, centrifugal forces flung the lighter materials toward the outer parts of the solar nebula.
You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction b. always point opposite to each other c. sometimes point in the same direction, and other times point opposite to each other d. depend on the way the ball is thrown e. depend on the mass of the ball
An 8.0-m massless rod is loosely pinned to a frictionless pivot at 0, as shown in the figure. A very small 4.0-kg ball is attached to the other end of the rod
The ball is held at A, where the rod makes a 30° angle above the horizontal, and is released. The ball-rod assembly then swings freely with negligible friction in a vertical circle between A and B. The tension in the rod when the ball passes through the lowest point at D is closest to A) 160 N. B) 200 N. C) 120 N. D) 80 N. E) 40 N.
The process of combining signals from separate telescopes to improve resolution is called ____________________
Fill in the blank(s) with correct word