Describe the rift valleys on Mars
What will be an ideal response?
When the crust of a planet is strained, it may break, producing faults and rift valleys. Near the Tharsis region on Mars is a great valley, Valles Marineris, named after the Mariner 9 spacecraft that first photographed it. The valley is a block of crust that has dropped downward along parallel faults. Erosion and landslides have further modified the valley into a great canyon. It is four times deeper, nearly ten times wider, and more than ten times longer than the Grand Canyon. The number of craters in the valley indicates that it is 1 to 2 billion years old, placing its origin sometime before the end of the most active volcanism in the Tharsis region.
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Differences among AGNs as viewed from different inclination angles is known as a ________________
Fill in the blank(s) with correct word
Why is a global magnetic field thought to be necessary for life to exist on the surface of a planet?
A) A magnetic field shields the planet from harmful ultraviolet light. B) A magnetic field helps form ozone in the upper atmosphere. C) A magnetic field helps keep the planet's atmosphere from being stripped away by stellar winds. D) A magnetic field helps warm the planet's surface through the greenhouse effect.
Two forces act on a 55kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.5 m/s2 B) 1.7 m/s2 C) 1.1 m/s2 D) 1.3 m/s2
A resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage V0. At the moment contact is made with the battery,
(a) the voltage across the resistor is A) V0. B) V0/e. C) V0/2. D) zero. (b) the voltage across the inductor is A) V0. B) V0/e. C) V0/2. D) zero.