Our textbook discusses the cosmic calendar, a model of the history of the universe scaled to a single year. The length of time represented by one month on this cosmic calendar is therefore
A) about ten million years.
B) about one million years.
C) about one billion years.
D) about ten billion years.
E) about 1000 years.
C
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What does this figure tell us?
A) The current level of carbon dioxide in our atmosphere is higher than it has been at any time during the past 800,000 years. B) Earth is now warmer than it has been at any time during the past 800,000 years. C) The current level of carbon dioxide in our atmosphere can be attributed to natural changes in Earth's climate. D) The level of carbon dioxide in our atmosphere changes randomly with time, so there is no way to predict how it will change during the next century. E) The current level of carbon dioxide in the atmosphere and the global average temperature are both higher today than at any other time during the past 800,000 years.
In M82, observations indicate that there are several bright sources close to the center of the galaxy. These might be
A) supernovae. B) accretion disks of supermassive black holes, millions of times as massive as our sun. C) accretion disks of intermediate black holes, hundreds of times as massive as our sun. D) accretion disks of stellar mass black holes. E) red giants in the process of forming planetary nebulae.
A fossil is found in a layer of strata below one layer dated at 8 million years. From this we can deduce the age of the fossil to be
A) between 7 and 8 million years old B) we can tell nothing about the fossil's age from this data C) older than 8 million years D) younger than 7 million years
A cubic box with sides of 20.0 cm contains 2.00 × 1023 molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s. The mass of a helium molecule is 3.40 × 10-27 kg
What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K. A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 9.10 Pa E) 2.26 kPa