The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant.
B. its speed is increasing.
C. its speed is decreasing.
D. its speed is a maximum.
E. its speed is a minimum.
Answer: B
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Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B. B) Galaxy B is four times as far as Galaxy A. C) Galaxy A is four times as far as Galaxy B. D) Galaxy B is twice as far as Galaxy A. E) Not enough information to say—you need to know Hubble's constant to answer this question.
If vector = -3.0 - 4.0 , and vector = +3.0 -8.0 , then the magnitude of vector = - is
A) 3.0 B) 16 C) 7.2 D) 144 E) 13.4
What factors are important when trying to classify a spiral galaxy?
a. Amount of dust and gas in the galaxy b. Structure of the spiral arms c. Size of the central region d. All of the above
A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A) 16 cm B) 30 cm C) -30 cm D) 6.8 cm E) -16 cm