Which of the following materials would not react with oxygen?

(a) Titanium
(b) Stainless steel
(c) Silicon carbide
(d) Alumina


(d) Alumina

Physics & Space Science

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Before the decoupling,

A) deuterium produced electrons and positrons. B) protons and electrons combined to form atoms. C) the universe was opaque to radiation. D) there was more helium than hydrogen. E) the universe was transparent to radiation.

Physics & Space Science

A particle moving along the x axis has a position given by x = 54t ? 2.0t3 m. At the time t = 3.0 s, the speed of the particle is zero. Which statement is correct?

a. The particle remains at rest after t = 3.0 s. b. The particle no longer accelerates after t = 3.0 s. c. The particle can be found at positions x < 0 m only when t < 0 s. d. All of the above are correct. e. None of the above is correct.

Physics & Space Science

For a periodic process, the number of cycles per unit time is called the

A) amplitude. B) wavelength. C) frequency. D) period. E) pulse.

Physics & Space Science

Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud

A) degeneracy pressure B) radiation pressure C) stellar winds D) thermal pressure

Physics & Space Science