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In the figure, a 100mA current flows through a copper wire 0.10mm in diameter, a 1.0mm diameter glass tube containing a salt solution, and a vacuum tube where the current is carried by an electron beam 1.0 mm in diameter. The density of conduction electrons in copper is 1.1×10^29 m^-3 . The current in the solution is carried equally by positive and negative ions with charges +/- 2e the density of each ion species is 6.2×10^23 m^-3 . The electron density in the beam is 2.5×10^16 m^{-3}. Find the drift speed in the electron beam.
A copper ion with a single electron (denoted Cu28+) is in an excited state with radius the same as that of the ground state of hydrogen. How much energy in eV is needed to ionize the ion from this excited state
A neutron turns into a proton and an electron. The electron goes in one direction and the proton goes in the opposite direction. find the maximum separation distance of the two particles
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
A physics professor is pushed up a ramp inclined upward at an angle 34.0 degrees above the horizontal as he sits in his desk chair that slides on frictionless rollers, Use the work-energy theorem to find his speed at the top of the ramp
Two point charges are placed along a horizontal axis with the following values and positions: +1 µC at x = 0 cm, At what point (the coordinate) along the x axis is the electric field zero
An eagle is flying horizontally at 5.7 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?
A 14.40 kg block and a 25.3 -kg block are resting on a horizontal frictionless surface. Between the two is squeezed a spring (spring constant = 1108 N/m).
A 5 kg box block is pushed 3 m up a vertical wall with constant speed by a constant force of magnitude F at an angle of 60 degrees with the horizontal.
A uniformly accelerated car passes three equally spaced traffic signs. The signs are separated by a distance d = 21 m. obtain the magnitude of the acceleration of the car
A power plant delivers energy at 880 MW using steam turbines. The steam goes into the turbines superheated at 625 K, What is the entropy increase per kilogram of the downstream river water
A container of volume V is divided by partitions into three parts containing one kilomole of helium gas, Calculate the kilomole fraction
An observer, whose eyes are 1.92m above the ground, is standing 31 m away from a tree. The ground is level and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 21° above the horizontal. How t..
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