Pluto is an example of a plutino
a. True
b. False
Indicate whether the statement is true or false
True
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What happens to the planets in a galaxy when that galaxy collides with another galaxy?
a) They are pulled out of their orbits by the tidal forces of the intruding galaxy. b) Smaller stars collide with each other, forming more massive stars which swallow the planets. c) Nothing, because the spaces between stellar systems in a galaxyis much larger thantheir size. d) They accrete a whole lot of new matter and become stars themselves. e) They ignite completely and explode violently.
The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?
To date relatively young rocks and materials, we use the decay of
A) uranium-238 to lead-206. B) potassium-40 to argon-40. C) carbon-14 to nitrogen-14. D) uranium-235 to lead-207.
The block shown in the figure has mass =7.0 kg and lies on a fixed smooth frictionless plane tilted at an angle theta=22.0 degrees to the horizontal.
(a) Determine the acceleration of the block as it slides down the plane.
(b) If the block starts from rest 12.0 m up the plane from its base, what will be the block’s speed when it reaches the bottom of the incline?
