The Wilkinson Mapping Project gave:
A) ?o = 1, but matter (dark and visible) is only 27% of this, the rest is dark energy.
B) a closed universe, where dark matter triumphs over dark energy.
C) an exact picture of the nature of dark energy.
D) us proof that 90% of matter is dark, only 10% normal.
E) the background cosmic temperature is 4.36 K.
A
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Angular Momentum: NASA puts a satellite into space that consists of two small 32-kg balls connected by a 12-m long light cable, as shown in the figure. The entire system is initially rotating at 4.0 rpm about an axis perpendicular to the cable at the center of mass. Motors in each mass reel out more cable so that the masses double their separation to 24 m.(a) What is the final rotational speed (in rpm) of the balls?(b) If the initial rotational kinetic energy of the system was K, what is the final rotational kinetic energy in terms of K?
Fill in the blank(s) with the appropriate word(s).
A car moves from a point located 26.0 m from the origin and at an angle of 35.0° from the x-axis to a point located 56.0 m from the origin and at an angle of 60.0° from the x-axis in 2.50 s
What is the magnitude of the average velocity of the car? A) 12.7 m/s B) 13.7 m/s C) 16.1 m/s D) 18.3 m/s E) 17.2 m/s
The maximum-kinetic-energy electron in the conduction band of a metal at 0 K is the _________energy.
Fill in the blank(s) with the appropriate word(s).
The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them