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A state department of transportation is interested in sampling commuters to determine certain of their characteristics. The department arranges for its field workers to board buses at random as well as stop private vehicles at intersections and ask the commuters to fill out a short questionnaire. Is this method cluster sampling? Explain.
Suppose you have a solution that contains 0.0490 M Ca2 and 0.0940 M Ag, When the second cation just starts to precipitate, what percentage of the first cation remains in solution
a heating element using nichrome connected to a 230 v supply draws an initial current of 3.2 a which settles after a
The astronomical object 4U0142+61 has the distinction ofcreating the most powerful magnetic field ever observed. This object is referred to as a "magnetar" (a subclass of pulsars), andits magnetic field is 1.30E+15 times greater than the Earth'sma..
The chain transmits 3.7 kW at a chain velocity of 4 m/s, and the sprocket diameter is 122.3 mm. The distance between the inside edges of the sprocket shaft support is 115 mm. Determine a satisfactory combination of bearing length, diameter, an..
A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. The small wheel has a radius of 2.0cm and accelerates at a rate of 7.2rad/s^2 and it remains in contact with the pottery wheel (radi..
A 5.70-kg ball is dropped from a height of 12.0m above one end of a uniform bar that pivots at its center. The bar has mass 6.00kg and is 4.80m in length. At the other end of the bar sits another 5.10-kg ball, unattached to the bar. The dropped ball ..
What's the largest diameter a spherical silver particle can have for there to be no more than 1 billion electron energy states over a 1 eV interval at 2 eV?
Calculate the Q-value, recoil energy of the daughter nucleus and the kinetic energy of the alpha particle in the following alpha decays
At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 8.9 meter above the water. Calculate the number of revolutions she makes while on the way down
q1. a 2.00 kg metal block slides on a rough horizontal surface inside an insulated pipe. after sliding a distance of
on a spacecraft two engines fire for a time of 541 s. one gives the craft an acceleration in the x direction of ax
A parallel plate capacitor has a capacitance of 1.20 nF. There is a charge of magnitude 0.800 μC on each plate. (a) What is the potential difference between the plates? (b) If the plate seperation is doubled,while the charge is kept constant, what wi..
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