Ultrasound is: a
of lower frequency than the human ear can detect.

b
the speed at which the latest, top-secret jet aircraft fly.

c
used to make internal images of the human body.

d
extremely painful to the human ear.

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

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

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx