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A certain lightbulb has a tungsten filament with a resistance of 20.5 ? when at 20.0°C and 136 ? when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large temperature range involved here. Find the temperature of the hot filament.
Calculate the force required to move an object.
When a firecracker is placed inside a bowling ball, the momentum before the explosion is equal to the momentum after the explosion because
A rocket with mass M is fired vertically upward. At the instant it reaches an altitude of 800m and a speed of v=350 m/s, it explodes into 3 fragments. one fragment with mass 1/2M moves upward with a speed of v1=400m/s following the explosion. The sec..
A transformer takes 120V (RMS) from a household circuit and drops it to supply a secondary circuit at 8V (RMS) to power a dorbell at 3.75A (RMS). What is the peak current in the primary coil of the transformer
An airplane flies eastward and accelerates uniformly. At one position along its path it has a velocity of 26.5 m/s. find the airplane\'s acceleration
In a movie, a person is supposed to jump with a motorcycle from the roof of one skyscraper to another one. what minimum initial speed would she need to make the jump
question1in a ldquorotor-riderdquo at a carnival people rotate in a vertical cylindrically wallednbspldquoroom.rdquo if
A worker on scaffolding 65 ft above the ground needs to lift a 340 lb bucket of cement from ground to a point 30 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required.
How strong is the electric field between the plates of a 0.70 microF air-gap capacitor if they are 3.0mm apart and each has a charge of 77 microcoloumbs
A particle starts from rest at x = 0 and moves for 15.7 s with an acceleration of +2.25 cm/s2. find the position of the particle at the end of this motion
A beam of photons that have a wavelength equal to 6.8pm is scattered by electrons initially at rest. What is the change in wavelength of the photons
Rusting of an iron nail is an example of a change of phase, true or false? This seems like a tricky question, because it is a chemical change-but would that be considered a change of phase?
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