The present motions of the planets were inherited from the rotation of the solar nebula
Indicate whether the statement is true or false
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Stellar and galactic crowding: The comparison of objects' sizes to the distance between them gives a sense of their relative density, i.e., how "crowded" they are. A typical human is about 1 meter across the shoulders
Compare the relative density of people in the case where they are standing on average 1 meter apart compared to a situation where they are on average 10 meters apart (hint: describe the separation in units of person-size). Now, compare the "crowding" of stars to that of galaxies. A typical star has a diameter of about 1 million km, while the average space between stars is about 5 light-years. A typical spiral galaxy in a cluster (such as the Milky Way) is 100,000 light-years across, and has another spiral galaxy within about 10 million light years.
Relative to the age of the universe, how old is our solar system?
A) It is about 1% as old as the universe. B) It is about one-third the age of the universe. C) It is nearly the same age as the universe. D) It is between about 5% and 10% as old as the universe.
An electron is in an infinite square well (a box) that is 2.0 nm wide
The electron makes a transition from the n = 8 to the n = 7 state, what is the wavelength of the emitted photon?(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 880 nm B) 750 nm C) 610 nm D) 1000 nm E) 1100 nm
Why do we use fuses?
a. to eliminate shock hazards b. to prevent fires c. to save on the cost of electricity d. to store charge