Find the momentum and speed of a proton whose kinetic energy equals its rest energy. (The mass of a proton is 938.3 MeV/c2)
1625 MeV/c, 0.866 0 c
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This photograph shows what appears to be four identical quasars arranged as a cross. What are we really seeing?
A) four images of a single quasar, with the images formed by gravitational lensing because a large galaxy lies between us and the quasar B) four quasars that are nearly identical because they were born at about the same time C) a picture taken with a poorly made telescope so that a single large object appeared as four fuzzy dots D) a large galaxy with four central masses that each glow brightly
A crate is at rest on a horizontal floor, with nobody pushing. The friction force acting on the crate is
A) zero. B) equal to the weight of the crate. C) between zero and the weight of the crate. D) none of the above
A 62.0-kg woman runs up a flight of stairs having a rise of 4.28 m in a time of 4.20 s. What average power did she supply?
a. 63.2 W b. 619 W c. 596 W d. 629 W e. 609 W
What are the primary components of all rock
forming minerals? a) oxygen and nitrogen b) hydrogen and helium c) oxygen and silicon d) iron and nickel