How is a rock defined?


A rock is any naturally occurring, solid mineral mass that makes up part of Earth's
lithosphere.

Physics & Space Science

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Uranus and Neptune do not contain liquid metallic hydrogen because they

a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the Sun. e. have magnetic fields that are much too weak.

Physics & Space Science

Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10-19 C, me1 = 9.11 × 10-31 kg)

A. 1.3 × 1018 m/s2 B. 3.0 × 1018 m/s2 C. 1.3 × 10-18 m/s2 D. 3.0 × 10-18 m/s2 E. 0 m/s2

Physics & Space Science

Irregular galaxies, although small, have large star-forming (HII) regions and much ongoing star formation for their size

Indicate whether the statement is true or false

Physics & Space Science

Which of the following thought of the idea that the intensity of a matter wave represents the probability that an interaction will occur?

A) Born B) Schroedinger C) Planck D) de Broglie E) Einstein

Physics & Space Science