An element has metallic bonding when the valence electron shell is ______________than half filled.
Fill in the blank(s) with the appropriate word(s).
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Impulse: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average force during the collision is correct?
A. The truck experiences the greater average force. B. The small car experiences the greater average force. C. The small car and the truck experience the same average force. D. The force experienced by each one is inversely proportional to its mass. E. The force experienced by each one is directly proportional to its mass.
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The power factor, cos ?, is
a. ?1.00. b. ?0.749. c. +0.749. d. +0.834. e. +1.00.
An electron initially in a 4p state decays to a lower energy state. Which energy state is forbidden?
A) 1s B) 2p C) 3d D) 2s
Why isn’t the crust of Venus broken into mobile plates as Earth’s crust is? How do you know?
a. Venus’s crust is much thicker and denser than Earth’s, so that probably prevents the crust from breaking. Moreover, there are no shield volcanoes on Venus. b. The mantle of Venus consists of great amounts of sulfur and fluorine, which makes mantle substances more solid and less plastic. So there are no traces of magma eruptions on Venus. c. Strong winds in the dense atmosphere of Venus sufficiently get rid of the interior heat, so there are no interior currents of matter to drive plate motion. Moreover, there are no shield volcanoes on Venus. d. Low-density, dryness, and pliability of Venus’s crust probably prevented it from breaking into rigid plates. On Venus there are no chains of composite volcanoes that form at plate boundaries.