Which of the following is NOT one of Hubble's types of galaxies?
A) normal spirals
B) irregular type II
C) dwarf ellipticals
D) barrel spirals
E) Seyfert spirals
E
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Free Fall: At the same moment, one rock is dropped and one is thrown downward with an initial velocity of 29 m/s from the top of a building that is 300 m tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.
Fill in the blank(s) with the appropriate word(s).
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the car
A) the force on the truck is greater then the force on the car. B) the force on the truck is equal to the force on the car. C) the force on the truck is smaller than the force on the car. D) the truck did not slow down during the collision. E) the car did not slow down during the collision.
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?
Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness because they harbor a black hole. Therefore, they provide direct evidence for black holes. B) Cepheids variables are supermassive stars that are on the verge of becoming supernovae. Therefore they allow us to choose candidates to watch if we hope to observe a supernova. C) Cepheids variables are a type of irregular galaxy, much more common in the early universe. Therefore they help to understand how galaxies formed. D) Cepheids variables are pulsating stars whose pulsation periods are directly related to their true luminosities. Therefore they can be used as distance indicators.