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Counting the unemployed? We could measure the extent of unemployment by a count (the number of people who are unemployed) or by giving a rate (the percentage of the labor force that is unemployed). The number of people in the labor force grew from 107 million in 1980, to 126 million in 1990, to 143 million in 2000, to 154 million at the end of 2007. Use these facts to explain why the count of unemployed people is not a valid measure of the extent of unemployment.
Photons with a frequency of 7.8 multiply.gif 1015 Hz shine on a piece of molybdenum (work function = 4.2 eV). What is the energy of the ejected electrons? What is the de Broglie wavelength of the ejected electrons?
consider the galvanic cell with sn2sn and agag both prepared with no3- as their anion and all solutions prepared at 1.0
Use Ampere’s law to determine the magnetic field in a densely wound toroidal solenoid with inner radius a, outer radius b, and N total turns. The cross section of the solenoid is a rectangle of width b-a and height h.
There is a uniform electric field throughout the region given by E = 4.9i + 7.1j + 3.6k in N/C units, What is the magnitude of the total flux through the five non-shaded faces
Three moles of an ideal monatomic gas are at a temperature of 393 K. Then 2568 J of heat is added to the gas, and 631 J of work is done on it. What is the final temperature of the gas
A bullet of mass m= 0.0230 kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.30 kg. find the speed of the bullet just before it hits the wood
At what rate is the flywheel spinning while the power comes back on. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on.
A small object with a mass of 330 mg carries a charge of 25.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. what is the potential difference between the plates
The sun radiates electromagnetic energy at the rate of 3.91×1026 W. What is the change in the sun's mass during one second? Express the answer as a positive mass
How much energy does a 100 watt light bulb use in 1 hour? Express your answer in joules Also find how much money it costs if electricity sells for 10 cents per kW-h.
In the drawing, the weight of the block on the table is450 N and that of the hanging block is160 N. the acceleration of the two blocks
question the speed of light in a material is 0.77timesc. what is the critical angle in degrees of a light ray at the
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