The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid water-rich world.
b. the climate on Mars was different billions of years ago.
c. volcanism is occurring on Mars.
d. the polar caps are made of liquid water.
e. all of the above
B
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Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest. b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. e. All the charges above experience equal forces when released in the same magnetic field.
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
a. 72 ?T b. 48 ?T c. 24 ?T d. 96 ?T e. 32 ?T
Glacial striations on the continental landmasses provide evidence
A) that Hawaii was once joined to Alaska. B) of the direction of Pleistocene ice flow. C) that the Cenozoic was a very cool time. D) that Baja California was once joined to Mexico.