Plants get their energy directly from the Sun and their carbon from the atmosphere. Given this, they can be classified metabolically as
A) photoheterotrophs
B) chemoheterotrophs
C) chemoautotrophs
D) photoautotrophs
D
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Angular Quantities: The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth, and its distance from Earth is 1.5 × 1011 m. What is the diameter of the sun?
Fill in the blank(s) with the appropriate word(s).
Discuss the role that methane plays in the appearances of Neptune and Uranus
What will be an ideal response?
At last, someplace fairly comfortable. Very weak gravity is holding you to the surface of the small object on which you sit. Your object is apparently moving away from a star, perhaps one that it orbits with a period of thousands of years
Around you, geysers are spouting gas into space. Looking back along the object's orbit, you see particles of dust that the geysers apparently blew off the object when it was nearer to the star that it is now leaving behind. You conclude that the geysers were recently much more active but are now settling down into a quiescent state that may last for millennia. You also soon realize that you are closer to home than you have been in all your previous journeys. Perhaps if you can somehow find a small rocket, a heat shield, and a good parachute, you can escape and head home for your final exam. Where are you? A) You are on an asteroid near the center of a galaxy, heading in toward a massive black hole. B) You have been shrunk in size and are riding a grain of interstellar dust that is carrying you on an orbit about our very own Sun. C) You are riding a jet of gas from a quasar that is headed in the direction of an ordinary star. D) You are on comet Hale-Bopp, circa May 1997. E) You are at Disneyland on the Moon, riding the new "wild and wet" roller coaster.
A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.1 m/s c. 0.80 m/s b. 1.6 m/s d. 0.57 m/s