Which of the following correctly lists two key pieces of evidence that, together, indicate that we should expect human activity to cause global warming?
A) (1) Carbon dioxide tends to make planets warmer than they would be otherwise.
(2) Measurements demonstrate that human activity is raising the carbon dioxide concentration in the atmosphere.
B) (1) The carbon dioxide cycle regulates Earth's climate.
(2) Human activity has disrupted the carbon dioxide cycle.
C) (1) The burning of fossil fuels is a form of human activity.
(2) Human activity is always bad for the environment.
D) (1) We can learn about past climate from ice cores.
(2) Ice cores show that Earth naturally has cooler and warmer periods.
A) (1) Carbon dioxide tends to make planets warmer than they would be otherwise.
(2) Measurements demonstrate that human activity is raising the carbon dioxide concentration in the atmosphere.
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The rate of cratering in the lunar highlands shows us that:
A) they must be younger than the older, darker mare. B) they range from 4.6-4.4 billion years old, on average. C) the largest impacts are the youngest, such as Copernicus and Tycho. D) the oldest rocks are at least as old as the mare, but some craters are much younger. E) most of the asteroids must have hit the Moon, not the Earth.
Which of the following statements about Pluto is not true?
A) It has more in common with comets in the Kuiper belt than it does with the jovian planets. B) It is orbited by at least three moons. C) Its mass is less than 1% of Earth's mass. D) It is the largest known object that is considered to be a dwarf planet.
Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s
They make a sudden perfectly inelastic collision. What is the magnitude of their combined momentum after the collision? A) 14 kg . m/s B) 26 kg . m/s C) 34 kg . m/s D) It cannot be determined without knowing the masses and velocities of the dogs.
The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases. b. entropy always increases. c. the entropy of the universe always remains constant. d. it depends only on the properties of the initial and final equilibrium states. e. systems always follow reversible paths.