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The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.50 mm is given by J = (3.00 x 108)r2, with J in amperes per square meter and radial distance r in meters. What is the current through the outer section bounded by r = 0.670R and r = R?
Consider a model thermodynamic system in which the allowed (nondegenerate) energy levels are 0, ? (epsilon), 2? (epsilon), 3? (epsilon). Determine how many macrostates are possible
a banked circular highway curve is designed for traffic moving at 55 kmh. the radius of the curve is 207 m. traffic is
An airplane is flying with a velocity of 87.0m/s at an angle of 20.0 degrees above the horizontal. How far from the dog will the suitcase land
transverse waves with a speed of 52.0 ms are to be produced on a stretched string. a 5.40-m length of string with a
The label on a candy bar says 440 Calories. Assuming a typical efficiency for energy use by the body, how high could she go
suppose a flat roof has a surface area of 1.38000times102 m2. presume the air inside the building and under the roof is
The plates of a parallel plate capacitor are separated by d = 2.8 cm. The potential of the negative plate is 0 V, and the potential halfway between the plates is +15 V. What is the electric field between plates (take the upward direction as the po..
A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. What is the average voltage induced as the flux is changing
A 0.45mW laser produces a beam of light with a diameter of 1.5mm. What is the average intensity of this beam
A trapeze artist swings in simple harmonic motion with a period of 4.2s. The acceleration of gravity is 9.81m/s2. Compute the length of the cables supporting the trapeze.
X rays diffract from a crystal in which the spacing between atomic planes is 0.193nm . The second-order diffraction occurs at 42.0?
an electron in a uniform electric field increases its speed from 2.5times107ms to 4.5times107ms over a distance of
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