Observations in the X-ray portion of the spectrum are routinely done from the surface of the Earth
Indicate whether the statement is true or false
FALSE
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Which organisms are multicellular eukaryotes, with the majority being photosynthetic producers?
a. plants b. animals c. fungi d. bacteria e. archaea
How is the energy that powers radio galaxies, quasars, and other active galactic nuclei produced?
A) by matter that has been converted to pure energy by interacting with the jets shot out by a central black hole B) by nuclear fusion near a central black hole C) by matter-antimatter annihilation near a central black hole D) by magnetic fields that trap and accelerate charged particles, which then radiate large amounts of energy E) by gravity, which converts the potential energy of matter falling toward a central black hole into kinetic energy, which is then converted to thermal energy by collisions among the particles of matter
A heavy sled and a light sled, both moving horizontally with the same speed, suddenly slide onto a rough patch of snow and eventually come to a stop
The coefficient of kinetic friction between the sleds and the rough snow is the same for both of them. Which of the following statements about these sleds are correct? (There could be more than one correct choice.) A) The friction from the snow will do more negative work on the heavy sled than on the light sled. B) The light sled will slide farther on the rough snow than the heavy sled. C) The heavy sled will slide farther on the rough snow than the light sled. D) Both sleds will slide the same distance on the rough snow before stopping. E) The friction from the snow will do the same amount of work on both sleds.
Five boys are pushing on a snowball, and each is pushing with a force of 20.0 N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0° relative to his neighbor.) What is the magnitude of the total force on the ball?
a. 54.2 N c. 24.1 N b. 48.3 N d. 0 N