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An incandescent light bulb is rated at 100 W when the applied voltage is 120 V.
(a) What is the resistance of the bulb when it is operating?
(b) A hot tungsten filament in a bulb has a temperature of about 2520°C. Find the ratio of resistances when the filament is hot to when it is cold, a temperature of 20°C.
(c) What is the resistance of your bulb when it is cold?
(d) When is the current through the bulb larger? (This helps explain why bulbs burn out when switched on.)When it is hot When it is cold
(e) The diameter of the wire in a filament is about 0.12 mm. How long is the filament in your bulb?
A 150 g aluminum cup contains 150 g of water and both are at 13 C. If you add 150 g of hot water at 90 C what is the final temperature at thermal equilibrium? How much hot water at 90 C needs to be added to achieve a final temperature of 44 C?
A thin, horizontal copper rod is 1.10 m long and has a mass of 203 g. What is the minimum current in the rod
Two resistors, of R1 = 2.93 ? and R2 = 6.69 ?, are connected in series to a battery with an EMF of 24.0 V, Find the current I1 through the first resistor
You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. how far (in kilometers) are you from the base of the arch
A circular-motion addict of mass 85 kg rides a Ferris wheel around in a vertical circle of radius 10 m at a constant speed of 5.9 m/s. What is the magnitude of the normal force on the addict from the seat when both go through the highest point of t..
A woman with mass 50 kg stands at the rim of a large disk rotating at 0.5 rev/s about its center axis. What is the difference in energy of the system
A rocket rises vertically, from rest, with an acceleration of4.0 m/s until it runs out of fuel at an altitude of1300 m. What is the velocity of the rocket when it runs out of fuel
A jumper in the long-jump goes into the jump with a speed of 12m/s at an angle of 20 deg above the horizontal. How long is the jumper in the air
A capacitor that is initially uncharged is connected in series with a resistor and a 400.4V emf source with negligible internal resistance, What is the resistance of the resistor
An excited electron in Na atom emits radiation at a wavelength 589nm and returns to the ground state. If the mean time for the transition is 20ns, ineherent width in the emission line.
You are assigned an experament to find g by dropping a 5 cm styrophoam sphere. Construct an uncertainty budget for this hypothetical situtation
A 111 gram apple falls from a branch that is 3.5 meters above the ground, How much time elapses before the apple hits the ground
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