You are on an airplane traveling with a constant velocity at an altitude of 20,000m. what is the acceleration of gravity at that altitude? the earth's radius is 6.37 x 10^6m.. a) 9.81 m/s^2. b) 9.78 m/s^2. c) 9.75 m/s^2. d) 9.72 m/s^2. e) 9.69 m/s^2.

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

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?