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An incandescent lightbulb emits 97 W of radiation. If the filament is at a temperature of 2818 K, what is the area of the filament?
in m2
Two converging lenses, each of focal length 13.1 cm, are placed 58.6 cm apart, and an object is placed 29.9 cm in front of the first. What is the magnification of the system
A Young's double-slit interference experiment is performed with blue-green argon laser light. What is the wavelength of argon laser light
A converging lens of focal length 8.000 cm is 20.3 cm to the left of a diverging lens of focal length -6.00 cm. Find the magnification of the coin's final image
Two objects (m1 = 2.15 kg and m2 = 4.30 kg) sit on a horizontal, frictionless surface and are pushed together with a compressed spring between them. How much energy was stored in the spring
The emissivity of tungsten is 0.35. A tungsten sphere of radius 1.5 cm is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K
A wire carries current to the north (towards the top of the computer screen) through a magnetic field. what is the direction of the magnetic force on the current-carrying wire
A 173-kg sculpture hangs from a horizontal rod that serves as a pivot about which the sculpture can oscillate. How far is the pivot from the sculpture's center of mass
A 48.9 kg girl is standing on a 129 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is the velocity of the plank relative to the ice surface
A capacitor is consists of two short sections of parallel wires in air. One wire is found to be of the voltage of 56 V, What is the capacitance of the two wires
Three resistors, 21, 39, and 73 , are connected in series, determine the potential difference across the three resistors
Identical samples containing 32P are measured for a period of 1 hr in a counter having an efficiency of 44 percent and a negligible background. From a large number of observations, the mean number of counts in 1 hr is (2.93 x 10^4)
If two sound waves, one in air and one in (fresh) water are equal in intensity, what is the ratio of the pressure amplitude of the wave in water to that of the wave in air? Assume the water and the air are at 20°C.
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