A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db
What is the total acoustic power output of the source, in watts? (Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)
6.3 × 10-4 W
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LMC X-3 is a binary system that is believed to contain a black hole
Indicate whether the statement is true or false
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. What is the work done by the applied force, in Joules?
A. 1,870 B. 1,770 C. 1,500 D. 1,450 E. 1,380
A white dwarf is
A) a cool and very small main sequence star with a mass of less than 1.4 of a solar masses. B) a hot but very small main sequence star with a mass of less than 1.4 solar masses. C) the exposed core of a dead star, supported by electron degeneracy pressure. D) the name for the singularity at the center of a black hole. E) the exposed core of a dead star, supported by neutron degeneracy pressure.
In the Bergeron process, condensation occurs on ______________
Fill in the blank(s) with correct word