Why did Saturn's rings appear very different in 1995 and 2003?
What will be an ideal response?
At equinox in 1995, the thin rings almost disappeared as seen from Earth. By solstice in 2003, the rings were tilted 27 degrees toward the Sun and more than doubled the planet's brightness.
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Organisms with the ability to be easily preserved as fossils began to flourish about
A) 4.6 billion years ago. B) 3.8 billion years ago. C) 543 million years ago. D) 65 million years ago.
An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?
A. 0.280 m/s2 B. 0.310 m/s2 C. 2.93 m/s2 D. 2.99 m/s2 E. 3.02 m/s2
A lens of focal length 10 cm is placed in contact with a lens of focal length -15 cm. What is the focal length of the combination?
A. -15 cm B. 6.0 cm C. 7.5 cm D. -5.0 cm E. 30 cm
What were the two primary courses of heating that let the Earth differentiate? Which is more important to us today?
What will be an ideal response?