Luminosity class V stars are larger than class Ia stars
Indicate whether the statement is true or false
FALSE
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Which of the following statements is FALSE?
A: For an observer located in a galaxy all other distant galaxies would appear to move away from his. B: The universe looks the same in all directions; i.e. it is homogeneous and isotropic. C: The universe is expanding. D: In our universe, at earlier times, everything was closer together. E: We are at the center of the universe.
A certain crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?
A. Still 200 N B. 400 N C. 800 N D. It depends (specify)
A parallel-plate capacitor has a capacitance of 25 µF. What potential difference across the plates is required to store 7.2 × 10^?4 C on this capacitor?
a. 2.9E+1 V b. 3.6E+1 V c. 4.5E+9 V d. 2.9E–1 V e. 4.5E+5 V
In the final phases of its "life", our sun will
A) collapse to become a white dwarf. B) turn into a cockroach. C) blow up in a supernova explosion. D) pass through the white dwarf state, then the neutron star state, and finally the black hole state. E) collapse and continue to collapse, forever.