Force F (see figure) is applied at C and is directed toward A. Its magnitude is F = 15 N. A unit vector along line CA is:
(A) -0.49i + 0.81j + 0.32k
(B) -0.5li + 0.73j + 0.39k
(C) 0.58i - 0.79j + 0.49k
(D) -0.65i + 0.22j + 0.43k
(A) 20.49i 1 0.81j 1 0.32k
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According to our theory of solar system formation, what three major changes occurred in the solar nebula as it shrank in size?
A) It got hotter, its rate of rotation increased, and it flattened into a disk. B) Its mass, temperature, and density all increased. C) It gained energy, it gained angular momentum, and it flattened into a disk. D) Its gas clumped up to form the terrestrial planets, nuclear fusion produced heavy elements to make the jovian planets, and central temperatures rose to more than a trillion Kelvin.
On a cold winter day, you turn up the thermostat in your house. Assume that your house is well sealed and that no air enters or leaves the house
When the air temperature in your house rises a short while later, what statement is correct regarding the air pressure? A) The air pressure is higher at the higher temperature. B) The air pressure is lower at the higher temperature. C) The air pressure does not change at the higher temperature. D) The air pressure increases at first but then decreases again as the temperature approaches its higher value. E) The air pressure decreases at first but then increases again as the temperature approaches its lower value.
The erosion process begins with
a)permafrost. b)meandering. c)landslides. d)weathering.
Figure R5.10 shows a two-observer space time diagram for an Other Frame that moves at a speed of 0.5 relative to the Home Frame. What are the coordinates of event P in the Other Frame?
A. t ? = 3.4 s, x ? = 2.6 s
B. t ? = 5.2 s, x ? = 2.6 s
C. t ? = 2.9 s, x ? = 1.2 s
D. t ? = 3.7 s, x ? = 3.4 s
E. Other (specify)