How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5×10^-11

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?

Let v1, v2, w be three linearly independent vectors in r 3 . that is, they do not all lie on the same plane. for each of the following (infinite) set of vectors, carefully sketch it in r 3 , and determine whether or not it is a vector space (i. e., a subspace of r 3 ). explain your reasoning