In the context of neutron stars, which of the following statements is true of pulsars?
A) Neutron stars older than 10 million years rotate too slowly to generate detectable radio beams.
B) When a pulsar first forms, it spins only around 10 times a second.
C) As a pulsar blasts beams of radiation outward, its rotation speeds up.
D) Supernova remnants last more than 150,000 years before they mix into the interstellar medium and disappear.
A
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When the Sun moves off the main sequence, it will next become a _______________
a. red giant b. dwarf star c. white dwarf d. black hole
A proton (being 1836 times heavier than an electron) gains how much energy when moving through a potential increase of one volt?
A) 1836. eV B) 1. eV C) 0 eV D) 1. Joule E) 1836. J
Suppose there are 2 moles of a gas in a container of fixed size and the average spacing of molecules in the container is 4.0 nm. If an additional 14 moles of the gas are added to the container and thermal equilibrium is established, what is the new average spacing of the molecules?
a. 2.0 nm c. 1.4 nm b. 0.50 nm d. 2.8 nm
Why is it so difficult to remove the lid from a vacuum-sealed jar?
A) The air pressure outside the jar pushes downward on the lid more strongly than the air pressure inside pushes upward on the lid. B) The higher pressure inside the jar pulls inward on the lid, holding it firmly to the jar. C) The vacuum inside the jar pulls inward on the lid, holding it firmly to the jar. D) The vacuum inside the jar pushes outward on the lid, holding it firmly to the jar. E) The air pressure inside the jar pushes upward on the lid more strongly than the air pressure outside pushes downward on the lid.