In a mass-energy census of the universe, what are the approximate proportions of normal matter, dark matter, and dark energy?
A) 68% dark matter, 27% dark energy, 5% normal matter
B) mostly normal matter, with only trace amounts of dark matter and dark energy
C) 27% dark matter, 68% dark energy, 5% normal matter
D) 33% dark matter, 33% dark energy, 33% normal matter
C) 27% dark matter, 68% dark energy, 5% normal matter
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An ideal spring with a spring constant (force constant) of is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 93 J B) 186 J C) 47 J D) 121 J
What effect could Wegener's continental drift (Chapter 10) have on climate? Explain
What will be an ideal response?
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.
The eye parts iris, retina, cornea, and ciliary muscle, play roles related to _____, _____, _____, and _____ in a camera
a. the aperture, the lens, the ccd, focusing b. the lens, focusing, the ccd, the aperture c. the lens, the aperture, focusing, the ccd d. the aperture, the ccd, the lens, focusing