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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
An electron moves with a speed v = 10-2c inside a one-dimensional box (V = 0) of length 0.971 nm. The potential is infinite elsewhere. The particle may not escape the box. What approximate quantum
A wave function has the value A sin x between 0 and π, but zero elsewhere. Normalize the wave function and find the probability that the particle is between x = 0 and 0.68.
You know that gasoline comes from its underground tank at 10 degrees celcius, and your tank must handle the expansion of a full 62 L gas tank when the gas reaches a hot summer day's temperature of 3
A glass marble 1.000 cm in diameter is to be dropped through a hole in a steel plate. At room temperature the hole diameter is 0.9970 cm. By how much must the steel temperature be raised so that the
A ferromagnetic material has a relative permeability of 2.87 Ã- 104. Find the magnitude of the magnetic dipole moment of a sphere of this substance with a radius of 2.83 cm when it is immers
You have a compound microscope with a barrel of length 161 mm. The focal lengths of the objective and the eyepiece are 3.91 mm and 26.3 mm, respectively. Find the total angular magnification of the
Suppose a single piece of welded steel railroad track stretched 5000 km across the continental United States. If the track were free to expand, by how much would its length change if the entire trac
The heat capacity of silver, measured at a temperature of 4 K, is 0.0134 J/(mole ·K). The Debye temperature of silver is 225 K. What is the lattice contribution (in J/(mole ·K)) to the h
What is the ratio of the intensity of light emerging from the third polarizer, I3, to the intensity of light incident on the first polarizer, I0?
How is the E field of a EM wave changed by vertical polarisation in terms of the general equation for electric field, ie E = Esin(kx-wt)?
Two converging lenses are separated by 23.40 cm. The focal length of each lens is 12.20 cm. An object is placed 36.40 cm to the left of the lens that is on the left. Determine the final image distan
Light reflects off of a water surface. If the incident angle odf the light is 28 degrees., at what angle is the light reflected back into the air?
What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance?
A minute later, the current is only 0.81 A. What is the temperature T (in degrees C) of the filament at that time? The voltage driving the lightbulb filament stays the same as the filament heats.
An LR circuit has a resistance R = 25 W, an inductance L = 5.4 mH, and a battery of EMF = 9.0 V. How much energy is stored in the inductance of this circuit when a steady current is achieved?
The current in an RL circuit is zero at time t = 0 and increases to 75% of its final value in 4.5 s. The time constant of this circuit is approximately
A coil of self inductance 7.5 mH and resistance of 30 W is placed across the terminals of a 12-V battery of negligible internal resistance. The current in this circuit after 50 ms is approximately:
The emf drives a current around the circuit. Neglecting friction, what force (in Newtons) is needed to keep the rod moving at a constant speed?
A compressed air cylinder stands 100 cm tall and has an internal diameter of 20.0 cm . At room temperature, the pressure is 180 atm . How many moles of air are in the cylinder? What volume would thi
A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions. If 50% of the power input to such a light bulb is emitted as electromagnetic radiation, what is the radiation int
The Sun radiates about 3.83x1026 W of power. How large should a perfectly reflecting solar sail be on a space ship of mass 50 kg to provide an acceleration of 10-4 m/s2 at the Earth's orbit? The rad
The heat capacity of silver, measured at a temperature of 4 K, is 0.0134 J/(mole ·K). The Debye temperature of silver is 225 K. What are the electronic contribution (J/(mole ·K)) to th
Electronic devices use electrical energy even when they are on standby. Calculate the percent of energy used per day for the following entertainment equipment in the standby mode assuming that they