Many pulsars have periods that are gradually increasing as the spinning neutron stars lose energy
Indicate whether the statement is true or false
T
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According to the "galactic fountain" model, what can create a superbubble emerging into the halo?
A) winds and jets from newly formed protostars B) a supernova occurring in the halo C) multiple supernovae occurring near one another around the same time D) the combined effect of spiral density waves E) molecular clouds expelled from the galactic center
The luminosity of a star is the ____
a. total energy radiated by the star at 100 parsecs b. total energy radiated by the star c. total energy radiated by the star in one second d. average energy radiated by the star in one month e. average energy radiated by the star in one year
Your weight is equal to mg when you are
A) firmly supported on a horizontal surface and in equilibrium. B) in Earth's gravitational field. C) anywhere except in Earth's orbit. D) all of the above
A rod has a length 2.00000 m at 10.0°C. The length of the rod increases to 2.00060 m when the temperature increases to 30.0°C. What is the coefficient of linear expansion of the material from which the rod is made?
A) 1.5 × 10-5/K B) 1.0 × 10-5/K C) 1.0 × 10-3/K D) 2.5 × 10-5/K E) 2.0 × 10-5/K