Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star.
B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants.
C) It doesn't make sense to find a subgiant in a binary star system.
D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star.
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Which of the following statements is true in the context of visible light spectrum?
A) Red light has more energy than blue light. B) Red light has a higher frequency than blue light. C) Red light has the shortest wavelength that can be seen by the average human eye. D) Red light has the longest wavelength that can be seen by the average human eye.
For angular momentum to be conserved, the net torque must be zero
Indicate whether the statement is true or false
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A. perpendicular to and into the page B. perpendicular to and out of the page C. in the direction of the magnetic field D. in the opposite direction of the magnetic field E. The force is zero.
A 1.5-kg object moving along the x axis has a velocity of +4.0 m/s at x = 0. If the only force acting on this object is shown in the figure, what is the kinetic energy of the object at x = +3.0 m?
A. 18 J B. 21 J C. 23 J D. 26 J E. 8 J