Which statement is true about white dwarf?
a. they are made of neutrons
b. they are made of mostly carbon
c. they are very dense and small in size (about the size of the earth)
d. they will eventually turn into black holes

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects