What affects the average orbital speed of a star in our galaxy?
A) the star's mass and the mass of the galaxy
B) the mass of the galaxy inside its orbit and the size of its orbit
C) the mass and age of the star
D) the mass and age of the galaxy
B
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What is meant by a desiccant?
What will be an ideal response?
Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work?
a) Mike b) Joe c) both did the same work
A primary difference between momentum and kinetic energy is
A) momenta can cancel; kinetic energy cannot. B) kinetic energy can cancel; momenta cannot. C) either of the above depending on circumstances D) none of the above
The direction of an electric field is the direction of the force exerted on
A) a neutral test charge. B) an electron. C) an atom. D) a proton. E) a molecule.