Maximum speed of the photoelectrons
Light is incident of the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 3.00 × 106 m/s. What is the wavelength of the light?
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Air at 14.7 psia and 60 °F enters a heavy duty compressor with negligibly small inlet speed. The air is discharge at a rate of 20 lbm/sec at 90 psia, and with a speed of 500 ft/s.
A particle lives for a short time before breaking apart into otherparticles. Suppose it is moving at a speed of 0.972c, and an observer who is stationaryin a laboratory measures the particle's lifetime to be 5.00 x 10-8 s. (a) What is the lifetime
Crate slides down the section of the spiral ramp such that r = (.5z)ft and z = (100 - .1t^2)ft, where t is in seconds. If the rate of rotation about the z axis is [theta]' = .04(pi)(t) rad/s, determine the magnitudes of the velocity and accelerati
Suppose a survey participant is randomly selected and you are told that he has a college degree. What is the probability that this man prefers the NFL? Is a survey participant's preference for the NBA independent of having a college degree?
Refrigerant 134a enters a compressor with a mass flow rate of 5 kg/s and negligible velocity. The refrigerant enters the compressor as a saturated vapor at 10 deg C and leaves the compressor at 1400 kPa with an enthalpy of 281.39 kJ/kg and a veloc
If a strain of -0.087 is measured by a strain gage, what stress must the Aluminum be experiencing? If the bar is pourus nd you have a strain of 0.04 at a stress of 60,000psi , what is the effective modulus of the material?
The end of a robtoic arm extends along the path of the limacon r = (1+.5 cos [theta])m. at the instant that [theta] = pi/4, the arm has angular rotation [theta]' = .6 rad/s, which is increasing at [theta]'' = .25 rad/s^2.
If a coal-burning electrical generating plant burns 2 tons of coal to generate 6000 kWh of electricity, calculate the efficiency of the plant as the ratio of electricity output to fuel energy input.
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