Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?
A) It increases by a factor of 16.
B) It increases by a factor of 8.
C) It is doubled.
D) It is quadrupled.
E) It remains the same.
E
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The right-hand rule allows one to find a property of the interaction of a magnetic field with a charged particle. The right-hand rule applied to moving charges:
a. results in positive charges moving clockwise. b. results in negative charges moving clockwise. c. can be used for positive charges only. d. gives the direction of the force on a charge moving in a magnetic field.
Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed b. motion of any charged particle changes c. motion of a positively charged particle is changed d. motion of a negatively charged particle is changed e. acceleration of any charged particle is changed
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.
Which of the following phenomena is not commonly associated with the star-formation process?
A) intense ultraviolet radiation coming from a protostar B) the formation of a spinning disk of material around a protostar C) powerful "jets" shooting out along the rotation axis of a protostar D) strong winds of particles blowing out into space from a protostar