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A certain lightbulb filament when hot has a resistance of205 %u03A9. The potential difference across the filament at acertain instant is standard household voltage, 120 V.
(a) What current is flowing through the bulb at that time?
(b) If thefilament of the bulb is a tungsten wire having a radius of475 %u03BCm, what is the magnitude of the currentdensity in the filament?
A stone is thrown from the top of a cliff 150 m above the ground, What is the speed (magnitude of velocity) of the stone when it hits the ground
A beam of 6 MeV electrons passes through a 400 micro-meter thick silicon detector. Estimate the energy lost by the electrons when crossing 200 micro-meters, 300 micro-meters and the full thickness of the detector.
A point source generating a spherical sound wave at 50Hz, Calculate the amplitude of the particle velocity at r=3m from the source
Two kids of masses 45 kg and 30 kg sit on the opposite sides of a seesaw. The 45 kg kid sits in the left at a distance of 54 cm from a frictionless axle. determine The force that the axle must exert
To explain why he seems to hang in the air, compute the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
what is the electric potential energy of this particle. what is its speed just before it strikes the positive plate.
You are on an airplane traveling 30 ° south of due west at 100 m/s with respect to the air. What is the heading of the plane with respect to the ground
Four objects are situated along the x axis as follows: a 1.70kg object is at -0.9m, a 1.60kg object is at 0.2m, a 2.4-kg object is at the origin, and a 2.50kg object is at -1.10m.
welding machine draws a 18A of current at 240V. When it is inadvertently connected to a 120V outlet, the current in it is 10A. Is the machine's resistance ohmic
The equation of a transverse wave on a string is given by the formula below. Find the linear density of this string in grams per meter
A copper rod, an aluminum rod, and a brass rod, each of 6.00 m length and 1.00 cm diameter, are placed end to end with the aluminum rod between the other two. What is the total entropy change of the water
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
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