How do we know that there is an insignificant amount of dark matter in our solar system?
What will be an ideal response?
Answer: We can measure the distribution of mass in the solar system through analysis of the orbital speeds of planets orbiting the Sun (i.e., making a rotation curve). This analysis tells us vast majority of the solar system's mass in the Sun, which means there cannot be much mass of any kind–including dark matter–in the rest of the solar system.
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A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
a. the first car will stop moving. b. the first car will move in the direction of the force. c. the first car's velocity will increase in magnitude but not change direction. d. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. e. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
Which of the following cannot be described by a field?
A) gravitational forces B) electrical forces C) magnetic forces D) radiation pressure
Electric voltage is defined as
a)charge transfer per unit time. b)work per unit charge. c)resistance per unit charge. d)work per unit time. ?
The Virgo cluster
a. is the galactic cluster that contains the Milky Way. b. is the oldest known cluster of galaxies. c. is located at the center of the universe. d. contains mostly spiral galaxies and very few elliptical galaxies. e. is a rich cluster and the closest cluster of galaxies outside of the Local Group.