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A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 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. Assume an initial temperature of 20.0°C.
___________________ °C
Consider a long wire that makes a right angle (90°) bend. If the wire carries a current I, what is the magnetic field at point A
Before starting this problem, review COnceptual Example 3. Suppose that hail described there bounces off the roof of the car with a velcity of +15 m/s. calculate the force exerted by the hail of the roof
Three radio-equipped plumbing vans are broadcasting on the samefrequency f0. Van 1 is moving east of van 2 with thespeed v, What is the frequency of each van as received by theothers
A set of 20 stairs, each of 20-cm height, is ascended by a 700 N man in a period of 1.25 s. Compute the mechanical work, power, and change in potential energy all through the ascent. I have 2800J. Where do I go from here.
A flat, uniform, circular disk (R = 2.25 m, m = 84.0 kg) is initially at rest, but it is free to rotate in the horizontal plane about a vertical, frictionless axis through its center.
suppose the apparatus as used in this lab: A cube of mass M = 500 g and side length 30 mm is free to spin on an axis through the center of one face. A massless pulley on this axis has a diameter of 2r = 10 mm. An object with m = 50 g is hung from ..
What will most likely cause arcing at the switch contacts.
What is the magnitude of the force of upper leg on the lower leg at the knee joint.
A 150 g block of ice at 0 C is dropped into 350 g of water at 25 C, compute the final equilibrium temperature
A wheel starts to rotate with constant acceleration and in 1minute performs 1000 rotations. Find acceleration and final speed of the wheel
220 cm3 of hot tea at 89°C are poured into a very thin paper cup with 70 g of crushed ice at 0°C. Calculate the final temperature of the "ice tea"
When a missile is shot from one spaceship toward another, What is the relative velocity of the two ships
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