Edwin Hubble and Milton Humason discovered that there was a linear relationship between a galaxy's ____
a. rotation curve and distance
b. mass and luminosity
c. age and distance
d. apparent recession velocity and distance
e. mass and recession velocity
d
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The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.0-m-long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
A. 1.0 m B. 2.0 m C. 2.5 m D. 4.0 m E. 8.0 m
A potential energy function for system 1 is given by U1(x) = Cx2 + Bx3. The potential energy function for system 2 is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
How does the force on system 1 relate to the force on system 2 at a given position? A) The force on the two systems will be in opposite directions. B) The force is identical on the two systems. C) The force on the second system will be with less than the force on the first system. D) There is no relationship between the forces on the two systems. E) The force on the second system will be with greater than the force on the first system.
The great contribution of Tycho Brahe was to ________
A) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks B) observe planetary positions with sufficient accuracy so that Kepler could later use the data to discover the laws of planetary motion C) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe D) discover that planets orbit the Sun in elliptical orbits with varying speed
Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. a and b e. all of the above