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An economist wants to estimate average annual profits for all businesses in a given community and proposes to draw a systematic sample of all businesses listed in the local Yellow Pages. Comment on the proposed methodology. What potential problem do you foresee?
Consider a galvanometer with an internal resistance of 60Ω. If the galvanometer is being used as an ammeter (with no additional resistance) it deflects full scale when it carries a current of 0.5 mA.
A car travelling 92 {rm km/h} is 150 {rm m} behind a truck travelling 80 {rm km/h}. How long will it take the car to catch the truck.
A 40.0 µF capacitor is connected to a 50.0 resistor and a generator whose rms output is 30.0 V at 60.0 Hz. Find the following values: The rms voltage drop across the capacitor
An rms voltage of 19.5V with a frequency of 1.50kHz is applied to a 0.365μF capacitor. What is the rms current in this circuit? By what factor does the current change if the frequency of the voltage is doubled?
To decide the speen of a harmonic oscillator, a beam of sound is sent along the line of the oscillator's motion. The sound, which is emitted at a frequency of 8000.0 Hz, is reflected straight back by the oscillator to a detector system.
An Olympic long jumper is capable of jumping 8.5m .Assuming his horizontal speed is 9.5m/s as he leaves the ground, How high does he go
Suppose 1.0 mol of a monatomic ideal gas initially at 10 L and 335 K is heated at constant volume to 670 K, What is the net work done by the gas during the cycle
A 10-cm-diameter cylinder of helium gas is 20 cm long and at 20°C. The pressure gauge reads 120 psi. how many helium atoms are in the cylinder? what is the mass of the helium?
At point A, 3,00 m from a small source of sound that is emitting uniformly in all directions, the sound level is 53.0 dB. what is the intensity of the sound at point A
A 0.69 book slides on a horizontal table. The kinetic friction force on the book has magnitude 1.2. How much work is done on the book by friction during a displacement of 2.7 to the left
Bob walks 340m south, then jogs 460m southwest, then walks 340m in a direction 35 degrees east of north. Find the direction of the displacement that will return Bob to his starting point by the most direct route
A spider hangs from a strand of silk whose radius is5.8x10-6 m. The density of the silk is 1100kg/m3. When the spider moves, waves travel along thestrand of silk at a speed of 310 m/s. Determine the mass of the spider.
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