Does Hubble's law work well for galaxies within the Local Group? Why or why not?
A) no, because galaxies in the Local Group are gravitationally bound together
B) no, because Hubble did not know the Local Group existed when he discovered his law
C) no, because we do not know the precise value of Hubble's constant
D) Yes, it works so well that we have never detected any measurable deviations from its predictions.
A) no, because galaxies in the Local Group are gravitationally bound together
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A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/h in 6.00 s. What distance will the sports car travel during the 6.00-s acceleration period? (Hint: First convert speed to m/s.)
a. 41.7 m b. 58.3 m c. 83.3 m d. 167 m e. 125 m
The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is __________ times the amount of heat added to the lead
Fill in the blank(s) with correct word
______________ will give you information on the surface temperature of the star after you obtain the wavelength of maximum emission from the ________________ spectra
Fill in the blank(s) with correct word
How do scientists estimate how old the universe is?
A) They look up the answer in a book. B) They measure how fast the Sun is losing energy, and how much energy it has to lose. C) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age. D) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance. E) They make a guess; no one really knows how old the universe is.