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C

Explanation:

Mass remains constant whilst weight varies based on the gravitational field strength. Weight is actually a measure of how much gravity affects the mass of an object.

C

Explanation:

The mass of the object is the same wherever it is. Weight is measured by the force exerted on the mass by the amount of gravity.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west