In a velocity selector consisting of perpendicular electric and magnetic fields, the speeds of the charged particles passing through the selector are increased or decreased until they are equal to the desired speed
A) True B) False
B
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Spiral density wave theory and self-sustaining star formation are ways to explain why ____
a. stars orbit the galaxy with different periods at different distances from the center b. sun-like stars are evenly distributed through the disk of the galaxy c. dark matter affects the orbit of stars outside the visible disk of the galaxy d. molecular clouds are compressed forming young stars along spiral arms e. the central bulge of the galaxy has a "bar" shape
How do we determine the amount of dark matter in elliptical galaxies?
A) We measure the orbital velocities of star-forming gas clouds around the outer portions of the galaxy. B) We measure the range of speeds of collections of stars at different distances from the galactic center and determine how much mass is interior to their orbits. C) We count the number of stars in the galaxy and determine its volume, so that we can calculate the galaxy's density. D) We search for dark lanes of dust and black holes within the galaxy. E) We measure how fast the galaxy rotates as a whole.
Microwave ovens work mainly by exciting molecules of the substance named ______________
Fill in the blank(s) with correct word
The specific heat of ice is 2.10 kJ/kg 
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100
is 2,256 kJ/ kg. What is the final equilibrium temperature when 30.0 grams of ice at -15.0
is mixed with 8.00 grams of steam at 100
?
A. 65.6
B. 60.2
C. 56.2
D. 50.1
E. 45.2