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Compute the temperature at which a tungsten filament that has an emissivity of 0.35 and a surface area of 3.0 10-5 m2 will radiate energy at the rate of 15 W in a room where the temperature is 13°C.
The frequency of a steam train whistle as it approaches you is 532Hz . After it passes you, its frequency is measured as 458Hz. How fast was the train moving
A thin, 70.0g disk with a diameter of 7.50cm rotates about an axis through its center with 0.270J of kinetic energy
Estimate the pressure exerted on a floor by (a) one pointed chair leg (60 kg on all four legs) of area=0.020 cm^2, and (b) a 1500-kg elephant standing on one foot (area=800 cm^2).
A spherical bowling ball with mass m = 3.3 kg and radius R = 0.11 m is thrown down the lane with an initial speed of v = 8.9 m/s. What is the magnitude of the final velocity
Babies recovering from surgery need to be fed milk from an open syringe through a nasogastric tube, a slender tube that passes in one nostril and down into their stomach
A symmetric double convex lens with a focal length of 25.0cm is to be made from glass with an index of refraction of 1.53. What should be the radius of curvature for each surface
a 15 kg hoop of radius 1 m is spinning at a rate of 4 rotations per second, What is the speed in rotations per minute
A 1.5-kg mass attached to spring with a force constant of 20.N/m oscillates on a horizontal, frictionless track. At t=0, the mass is released from rest at x=10.0 cm (That is, the spring is stretched by 10.00cm)
A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.7x10-3 kg bullet with a speed of 630 m/s
A 20 kg piece of steel pipe that is 20 cm in diameter, 80 cm long, What is its angular velocity and its total kintetic energy
The brakes are applied to a car traveling on a dry, level highway. A typical value for the magnitude of the car's acceleration is 4.55 m/s2. how long does it take to stop and how far does it travel
a find the wavelength of the sound upwind of the siren.b find the wavelength of the sound downwind of the siren.c
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