There are constellations that are not visible for observers living in North America.
Answer the following statement true (T) or false (F)
True
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How many significant figures are in 120.07?
A) 6 B) 5 C) 4 D) 3 E) 2
According to Einstein, gravity is not the force exerted by one object on another, but rather the
A) effect we witness when a large mass causes a curvature in the shape of spacetime. B) force of attraction that exists between two objects. C) effects of the graviton particle. D) curvature of space caused by objects reaching the speed of light.
Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter. B) They have more surface area than main-sequence stars of the same temperature. C) They have very low luminosities because of their big size. D) Red dwarfs are giant stars that are hot and have high luminosities.
A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?
A) The electric and magnetic fields must be perpendicular to each other in that region. B) The electric and magnetic fields must be parallel to each other in that region. C) Both electric and magnetic fields must be zero in that region. D) The electric field must be zero but not the magnetic field in that region. E) The magnetic field must be zero but not the electric field in that region.