Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________
What will be an ideal response?
Star B
You might also like to view...
Compared to the star it evolved from, a red giant is
A) hotter and dimmer. B) the same temperature and brightness. C) cooler and brighter. D) cooler and dimmer. E) hotter and brighter.
A pencil balanced on its tip such that it does not move
A) is in unstable equilibrium. B) is in stable equilibrium. C) has a net torque acting on it. D) has a net vertical force. E) has a zero moment of inertia.
A copper pipe is held vertically and a magnet is dropped down the pipe. The magnet is oriented with the north pole down. What direction do the Eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight is dropped down the tube will it fall faster or slower?
A. CCW above the magnet and CW below the magnet; copper bar will fall slower B. CCW above the magnet and CW below the magnet; copper bar will fall faster C. CW above the magnet and CCW below the magnet; copper bar will fall slower D. CW above the magnet and CCW below the magnet; copper bar will fall faster
Click the third tab (labeled "Global Warming"), then explore the graph and the expanded views you will find by clicking the "?" buttons. Which of the following statements are supported by the data shown?
a. Earth's global temperature today is higher than it has ever been before. b. Rises in global average temperature tend to be closely associated with rises in atmospheric carbon dioxide concentration. c. Earth's global average temperature has generally risen over the past century. d. Atmospheric carbon dioxide levels have risen dramatically over the past century. e. Human activity has caused the carbon dioxide concentration to swing up and down wildly over the past 800,000 years.