Why is M-42, the Orion Nebula, so important to us?
What will be an ideal response?
It is the closest and brightest region of active star formation visible to most of the astronomers of the world. It is bright enough to be seen with the naked eye, and a cinch to find just below the belt of Orion. We can detect young protostars still hiding behind their cocoons of dust with infrared telescopes, and watch their T-Tauri winds blow away the dust and reveal the young stars stabilizing on the main sequence. Many of the protostars show dusty disks, suggesting that planet formation is routine, and some brown dwarfs are also evident, still hot from gravitational contraction.
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Escape speed from Mars is
A) about the same as from Earth. B) greater than from Earth. C) less than from Earth.
A ball is falling toward the ground. Which of the following statements are false?
a) The force that the ball exerts on the Earth is equal in magnitude to the force that the Earth exerts on the ball. b) The ball undergoes the same acceleration as Earth. c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.
1. Statements a and b are false. 2. Statements a, b, and c are all false. 3. Statements a and c are false. 4. Statements b and c are false.The free-stream flow outside a boundary layer is:
(A) Either laminar or turbulent, depending on the Reynolds number (B) A smooth flow free of disturbances (C) An irrotational flow (D) Neither laminar nor turbulent
A small cylinder made of a diamagnetic material is brought near a bar magnet. One end of the cylinder is brought near the North pole of the magnet and is repelled
What happens when the other end of the cylinder is brought near the North pole of the magnet? A) The other end of the cylinder will not be affected by the magnet. B) The other end of the cylinder will be attracted less strongly by the magnet. C) The other end of the cylinder will be attracted by the magnet. D) The other end of the cylinder will be repelled by the magnet. E) The other end of the cylinder will be attracted more strongly by the magnet.