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The conductivity of tungsten at room temperature, s = 1.8 107 (A/m2)/(V/m), is significantly smaller than that of copper. At the very high temperature of a glowing light-bulb filament (nearly 3000 degrees Kelvin!), the conductivity of tungsten is 18 times smaller than it is at room temperature. The tungsten filament of one of your round bulbs has a radius of about 0.015 mm. Calculate the electric field required to drive 0.15 amperes of current through the glowing bulb and show that it is huge compared to the field in the connecting copper wires.
A particle has a charge of +2.3 ?C and moves from point A to point B, a distance of 0.12 m. Find the magnitude of the electric force that acts on the particle
A jetliner, traveling northward, is landing with a speed of 65m/s. Once the jet touches down, it has 715 m of runway in which to reduce its speed to 6m/s
a hiker throws a stone from the upper edge of a vertical cliff. the stone's initial velocity is 25m/s directed at 40 degrees. with the face of the cliff. whats the height of the cliff?
a target plane flies at 2100 meters. an anti-craft gun fires a projectile with an initial upward velocity of 200
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, what is the mass of one cubic meter of the atmosphere
A spring is first stretched 2.0 cm from its unstressed length. It is then stretched an additional 1.7 cm.How does the work required for the second stretch compare to the work required for the first stretch (give a ratio of second to first)?
A 2.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.2 cm and that of the needle is 0.30 mm. With what force does the fluid leave the needle
The left ventricle of the heart accelerates blood from rest to a velocity of +24 cm/s^2. How much time does it take for the blood to reach its final velocity
A sample contains 3.5Ã-1019 radioactive atoms with a half life of 10000 years. How many atoms are expected to decay in the first second
a piece of copper at 320 degrees celcius is dropped into 1.9 kg of water at 16 degrees celcius. if the equilibrium
The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. What was the winner's metabolic power in watts during the race up the stairs
An object of mass 5 kg is dropped from a certain height. Just before it strikes the ground it has a kinetic energy of 1250 J. From what height was the object dropped
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