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A standard 100 W (120 V) lightbulb contains a 9.40 cm-long tungsten filament. The high-temperature resistivity of tungsten is 9.0*10^-7Om. What is the diameter of the filament?
An engineer wishes to determine the specific heat of a new metal alloy. A 0.150-kg sample of the alloy is heated to 540°C. Calculate the specific heat of the alloy
You wish to boil 1.1 kg of water, which has a specific heat capacity of 4186 J/kg-K. The water is initially at room temperature (293 K). Water boils at 373 K. How much energy must be added to the water by heating it in order for it to start boiling
A loudspeaker of mass 18.00 {rm kg} is suspended a distance of h = 1.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling.
a cylindrical resistor of radius 1.0 mm and length of 1.0 cm has resistance of 10 ohms. calculate the uniform current density in the resistor when the power of the resistor is 1 watt
A 100 percent efficient electric motor is lifting a 15N weight at 25cm/s. If the motor is connected to a 7V battery, how much current does it draw.
An airplane is flying at an altitude of 2500m above the ground when it sees a stranded on a an island 4000m away. If a pilot lets go of a rescue package and it lands on the island, how fast was the plane traveling? what was the final velocity of the..
The brick wall of a building has dimensions of by and is thick. How much heat ?ows through the wall a period when the average inside and outside temperatures are, in that order.
A satellite is orbiting the Earth at a distance of 2.67RE and with a speed of 4.29 km/s. With what speed would the satellite hit the Earth's surface
A driver in a car travelling at the speed of 78 km/h sees a cat km away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m.
A conductor bar ab of length 0.6 m is moving on two conducting rails with a speed v = 3.6 m/s perpendicular to a uniform magnetic field of B = 0.35 T. find the electromotive force in the bar
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.3 {rm mm}. This results in an interference pattern on the screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, t..
An L-R-C series circuit consists of a 2.50?F capacitor, a 5.50mH inductor, What is the maximum current through the capacitor
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