Why does the image show very few stars?
A: It is hard to find stars in the Milky Way Galaxy, so it would have been too difficult to select a region that had many.
B: Stars are only visible in radio waves, and the Hubble Deep Field image was taken in the optical region of the spectrum.
C: Stars are only visible in the optical region of the spectrum, and the Hubble Deep Field image was taken with a radio telescope.
D: It was chosen so that bright stars in the Milky Way Galaxy do not interfere with our picture of the distant universe.
E: The scientists were interested seeing the light of galaxies through a region of space filled with black holes.
Ans: D: It was chosen so that bright stars in the Milky Way Galaxy do not interfere with our picture of the distant universe.
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A spacecraft can gain energy by passing near a planet
a. True b. False Indicate whether the statement is true or false
The highest frequency in visible light is associated with the color
A. red. B. orange. C. green. D. blue. E. violet.
How does a rocket launch upwards? Choose the statement that best describes why a rocket goes up
A) By expelling gas downwards, the rocket is propelled upwards. B) By expelling gas, the rocket loses mass; because it is lighter, it rises up. C) By expelling gas downwards, which pushes against the ground, the rocket is propelled upwards.
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N / m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA