Life emerged on Earth about a billion years after the solar system formed
Indicate whether the statement is true or false
TRUE
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The heating of a ferromagnet in an alternating magnetic field is due to
(a) Induced free electron current loops. (b) Alterations of atomic electron orbitals. (c) Switching of electron spin orientations. (d) Friction created by Bloch wall motion.
When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of
A) less than 1000 N. B) more than 1000 N. C) 1000 N.
Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 0.5c B) 0.1c C) 0.7c D) 0.9c E) 0.3c
In the Drude model of electrical conduction, the current density is NOT directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the resistivity of the wire.