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The bonding of silicon in solids and molecules is qualitatively the same as that of carbon. Silicon atomic states become molecular states and in a solid, these effectively form the valence and conduction bands. Which of silicones atomic states are relevant ones, and which molecular state corresponds to which band?
Earth has a radius of 6.38 × 106 m, and is about 1.50 × 1011 m from the Sun. Mars has a radius of 3.40 × 106 m, what is the intensity of electromagnetic solar radiation at Mars
A charge q is distributed uniformly around a thin ring ofradius r. What is the direction of this magnetic moment if the chargeis positive
When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. determine the average pressure of the expanding gas
Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. find the oxygen concentration at the interior end of the tube
a copper crystal has a homogeneous dislocation density of 1010 m-2. what is the approximate elastic strain energy of a
q1. a hydrogen atom has a diameter of around 1.05times10-10 m as defined by the diameter of the spherical electron
A pipe open at both ends has a fundamental frequency of 120 Hz. what is the fundamental frequency of this pipe
a beam of electrons is shot into a uniform downward electric field of magnitude 1.01 x 103 nc. the electrons have an
Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.3 km x 0.3 km, What is the mass of the mud sitting above a 4 m2 area of the valley floor
In the figure below, two skaters, each of mass 35 kg, approach each other along parallel paths separated by 2.2 m. They have opposite velocities of 1.9 m/s each. What is the angular speed of the skaters
a 4 kg box is pushed up a frictionless 30 degree incline with a force of 40n. this 40 n force is parallel to the
An electric fan is turned off, and its angular velocity decreases uniformly from 490rev/min to 210rev/min in a time interval of length 4.45s. Find the number of revolutions made by the fan blades during the time that they are slowing down in Part A
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