According to Newton, the closer gravitationally interacting objects are to each other, theA) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them
A) less the gravitational force between them.
B) more the gravitational force between them.
C) constancy of the force between them.
Answer: B
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Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
A) Dark matter is the dominant form of mass in both clusters and in individual galaxies. B) Dark matter is present between galaxies in clusters, but not within individual galaxies. C) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster. D) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center.
The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years B) is higher than it has been at any time during the Earth's history C) has remained roughly constant during the last 800,000 years D) is lower than it has been at any time during the last 800,000 years
A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
A. ?500 km/s2 B. ?550 km/s2 C. ?360 km/s2 D. ?520 km/s2 E. ?275 km/s2
The Milky Way is moving further away from most other galaxies in the universe
Indicate whether the statement is true or false