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Nitrogen gas is heated by a pulsed laser to 50 000 K. If the diameter of the nitrogen atoms is assumed to be 1.0 ´ 10-10 m, and the pressure is 1.0 atm, what is the mean free path?
A steel wire in a piano has a length of 0.60- m and a mass of 4.5 x10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale).
The electric output of a power plant is 730MW . Cooling water flows through the power plant at the rate 1.30 ×108L/hr. What is the power plant's thermal efficiency
A closely wound rectangular coil of 100 turns has dimensions of 20.0{\rm cm} by 50.0{\rm cm}. What is the average emf induced in the coil
determine the weight of the collar.
A constant net force of 75N acts on an object initially at rest as it moves through a parallel distance of 0.60m. What is the final kinetic energy of the object
A sample contains 8.30×104 radioactive nuclei. In a time of 5 minutes, Evaluate the half life of the sample
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
A 71 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A is 7.0m/s , what is the normal force exerted by the snow on the skier at point B? Ignore fricti..
The telescope at a small observatory has objective and eyepiece focal lengths respectively of 20.0 m and 12 cm. determine length of the barrel of the telescope
A proton is propelled at 2 x 10^6 m/s perpendicular to a uniform magnetic field. If it experiences a magnetic force of 5.8 x 10^-11 N, find the strength of the megnetic field
A hypodermic needle consists of the plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of syringe are forced through a hollow needle.
A cardinal (Richmondena cardinalis) of mass 4.30×10-2 and a baseball of mass 0.14 have the equal kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of baseball's momentum.
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