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Under ambient conditions (T=300K ), the intrinsic electron concentration of silicon (Si) is ni=1.45*10^10cm^-3. Calculate the band gap energy of the semiconductor if the effective masses of electrons and holes are m*e=1.08me and m*h=0.7me, respectively.
A soccer ball is kicked with an initial horizontal velocity of 18 m/s and an initial vertical velocity of 13 m/s, What is the initial speed of the ball, What is the initial angle of the ball with respect to the ground
A ball is thrown up with a velocity of 8 m/s and allowed to fall back down. how long will the ball take to return to its initial position
An object moves with constant acceleration 4.35 m/s2 and over a time interval reaches a final velocity of 11.0 m/s. What is the distance it travels during this interval
A box with a mass of 5 kg initially moving at 3 m/s comes to rest in a distance of 9 m. what is the magnitude of the net force acting on the box
A spherical conducting shell has an interior radius of 18 cm and an outer radius of 21cm. The shell carries a net charge of -2.4 micro coulombs. A point charge of charge +6.4 micro coulombs is placed at the center of spherical shell.
The electric field everywhere on the surface of a thin spherical shell of radius 0.780m is measured to be equal to 940 N/C and points radially toward the center of the sphere.
A gymnast with mass m1 = 49 kg is on the balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 126 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left en..
Two blocks of weights 70.0 and 100.0 N are connected by as massless string and slide down an inclined plane making an angle of 42.0 deg. find the magnitude of the heavier block's acceleration
A torque of 2.2 N.m is applied to a spherical shell of radius 0.25 m. what is the mass of the disk
A cylinder 25 cm long is partly filed with water. A loudspeaker held over the cylinder causes the air column to resonate, what is the hight of the water in the cylinder
What is the maximum speed the car. A roller-coaster car speeds down a hill past point A where R1 = 8.0 m and then rolls up a hill past point B where R2 = 15.0 m.
A small block with a mass of 0.120kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.50 m from the hole with a speed of 0.70m/s. The cord is then pulled from ..
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