In a neutron star, the electrons in the core are all in contact with each other
Indicate whether the statement is true or false
FALSE
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A 30-year-old astronaut goes off on a long term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, the astronaut's age would be
A) more than 50 years. B) exactly 50 years. C) less than 50 years. D) exactly 30 years. E) exactly 25 years.
Angular Momentum: NASA puts a satellite into space that consists of two small 32-kg balls connected by a 12-m long light cable, as shown in the figure. The entire system is initially rotating at 4.0 rpm about an axis perpendicular to the cable at the center of mass. Motors in each mass reel out more cable so that the masses double their separation to 24 m.(a) What is the final rotational speed (in rpm) of the balls?(b) If the initial rotational kinetic energy of the system was K, what is the final rotational kinetic energy in terms of K?
Fill in the blank(s) with the appropriate word(s).
Energy Conservation With Conservative Forces: A spring-loaded dart gun is used to shoot a dart straight up into the air, and the dart reaches a maximum height of 24 meters. The same dart is shot up a second time from the same gun, but this time the spring is compressed only half as far (compared to the first shot). How far up does the dart go this time (neglect all friction and assume the spring is ideal)?
A. 6.0 m B. 12 m C. 3.0 m D. 48 m
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by
A) conduction. B) condensation. C) evaporation. D) melting.