Brown dwarfs are failed stars, never igniting their hydrogen fusion
Indicate whether the statement is true or false
TRUE
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Do individual galaxies expand in size as the universe expands? Why or why not?
What will be an ideal response?
As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the
A) air resistance acting against the ball. B) acceleration of the ball. C) ball's pull on Earth. D) none of the above
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
A. (?3, ?1) m B. (+1, +3) m C. (+3, ?1) m D. (?1, ?3) m E. (?0.5, ?2) m
If you shine a flashlight "horizontally" from one wall to an opposite wall inside an accelerating spaceship in deep space, you will see the light traveling
A) in a straight-line path. B) in a parabolic path. C) along the arc of a circle.