Based on star counts, 100 years ago most astronomers thought:
A) we lay about 30,000 ly out from the center of the Galaxy.
B) we lay near the center of a disk about 10 kpc wide and 2 kpc thick.
C) we lay in a spiral arm of the largest galaxy in the universe.
D) we lay near the edge of the only galaxy in the universe.
E) we were not a part of any structure larger than the known solar system.
B
You might also like to view...
The energy dissipated in a light bulb in a circuit is provided by the
A) lamp filament itself. B) wires leading to the lamp. C) voltage source. D) none of the above
A teacher sends her students on a treasure hunt. She gives the following instructions: 1. Walk 300 m north 2. Walk 400 m northwest 3. Walk 700 m east-southeast and the treasure is buried there
As all the other students walk off following the instructions, Jane physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Jane need to walk? A) 187 m in a direction 67.3° north of east B) 481 m in a direction 40.9° north of east C) 399 m in a direction 52.5° north of east D) 284 m in a direction 28.2° west of north E) The treasure position cannot be reached in one straight walk.
What percentage of the Solar wind is hydrogen (H)? This is just the ratio of hydrogen to everything expressed as a percentage.
What will be an ideal response?
Daisy raises 10.Kg to a height of 2.5 meters in 2.0 seconds. (a) How much work did she do? (b) How much power was expended? (c) If she raises it in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?