The water hole is a region around Sun-like stars where liquid water can exist on the surfaces of terrestrial planets
Indicate whether the statement is true or false
FALSE
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Predict the heat transfer per unit area for warm water at 70ºC placed in a large pan at 10ºC.
What will be an ideal response?
Dark matter in galaxies and clusters of galaxies is purely hypothetical because we have no way of detecting its presence
Indicate whether the statement is true or false
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be much less than it is today. B) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. C) The total amount of gas will be much greater because many stars will undergo supernovae between now and then. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
A 14-A current flows into a series combination of a 3.0-? and a 4.0-? resistor. What is the voltage drop across the 3.0-? resistor?
A) 42 V B) 56 V C) 98 V D) 38 V E) 24 V