The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere

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Physics & Space Science

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Radio maps of the spiral arms of our galaxy

a. reveal that our galaxy is a grand design spiral. b. map the location of hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the Sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds.

Physics & Space Science

A freely-falling watermelon falls with constant

A) velocity. B) speed. C) acceleration. D) distances each successive second.

Physics & Space Science

Astronomers observe unobscured X-rays generated in active galactic nuclei

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Physics & Space Science

A uniform ball with diameter of 10 cm rolls without slipping on a horizontal tabletop. The moment of inertia of the ball about an axis through its center is 2.2 × 10-3 kg ? m2,

and the translational speed of its center is 0.45 m/s. (a) What is its angular speed of the ball about its center of mass? (b) What is the rotational kinetic energy of the ball? (c) What is the ball's angular momentum about its center of mass?

Physics & Space Science