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A tunnel diode junction is approximated by a rectangular barrier 100Å thick and 3.3 eV high. If 1.00 x 1025 electrons strike the barrier each second with kinetic energy 3.1 eV, and the effective electron mass is 0.30m, what current passes the junction?
The displacement vectors 38.5 cm at 15.0° and 23.0 cm at 62.0° both start from the origin and form two sides of a parallelogram. Find the area of the parallelogram
a horizontal rifle is fired at a bulls-eye. the muzzle speed of the bullet is 670 ms. the gun is pointed directly at
Light of wavelength 480nm is incident on a metallic surface with a resultant photoelectric stopping potential of .55V. What is the work function of the metal
A 500g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 12N
A child of mass 24 kg sits 2.10m to the left of the center of a seesaw. The mass of the seesaw is 35 kg. How far to the right of the central pivot must a second child of mass 40 kg sit if the seesaw is to be perfectly balanced.
During a hard sneeze, your eyes might shut for 0.50s. If you are driving a car at 90 km/h during such a sneeze, how far does the car move during time.
A trash can with a mass of 15 kg has a coefficient of static friction of μs = 0.80 and a coefficient of kinetic friction of μk = 0.22. Determine the acceleration of the trash can as it moves
calculate the angular magnification of the telescope
A 150 g copper bowl contains 220 g of water, both at 20.0ºC. A very hot 300g copper cylinder is dropped into the water, What was the original temperature of the cylinder
a playground merry-go-round has a mass of 281 kg which can be viewed as being uniformly distributed over a disk of
Calculate the Coulomb force on q1 as seen in the figure below. Choose forces to the right be positive and forces to the left negative. Assume q1 = 1.80μC , q2 = 6.32μC and q3 = -2.90μC. r1 = 3.25 cm and r2 = 1.99 cm.
A child on a sled starts from rest at the top of a 15.0° slope. If the trip to the bottom takes 17.3 s how long is the slope? Assume that frictional forces may be neglected
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