The parallax shift of a nearby star would be ________ that of a more distant star.

A. greater than
B. brighter than
C. the same as
D. faster than
E. less than


Answer: A

Physics & Space Science

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A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1200 kg car after the collision is

A. 4.0 m /s EAST. B. 1.0 m/s EAST. C. 4.0 m/s WEST. D. 1.0 m/s WEST. E. 3.00 m/s EAST.

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In Bohr's model of the atom, electrons:

A) only make transitions between orbitals of specific energies. B) are not confined to specific orbits. C) are spread uniformly through a large, positive mass. D) can be halfway between orbits. E) move from orbit to orbit in many small steps.

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The radius of an approximately spherical nucleus is given by r =

a. r0Z3. b. r0Z1/3. c. r0A3. d. r0A1/3. e. r0(A ? Z)1/3.

Physics & Space Science

Earth's first atmosphere was composed of

A) oxygen, hydrogen, and helium. B) hydrogen and helium, with trace amounts of ammonia and methane. C) gases from volcanic eruptions. D) oxygen, water vapor, carbon dioxide, and methane.

Physics & Space Science