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The power (in watts) used to move air out of the lungs is equal to the air pressure (in N/m2) multiplied by the air flow rate (in m3/s). For quiet breathing (where p = 100 N/m2 and flow rate = 100 cm3/s or 1.0 x 10-4 m3/s), the power involved = _____W ; for loud singing (where p = 4000 N/m2 and flow rate = 400 cm3/s or 4.0 x 104 m3/s), the power involved = _____W.
Two small beads having positive charges24qandqare fixed at the opposite ends of a horizontal insulating rod, At what position is the third bead in equilibrium
A group of swimmers is resting in the sun on an off-shore raft. How fast are the waves moving
Two converging lenses having focal lengths of f1 = 10.5 cm and f2 = 20.0 cm are placed d = 50.0 cm apart. Is the final image upright or inverted
A track star in the broad jump goes into the jump at 12 m/s and launches her at 20 degrees with respect to the horizontal. How long is she in the air before returning to Earth
An extension cord is used with an electric weed trimmer that has a resistance of 18.3 ?. Determine the resistance of the extension cord
Thermistor calibration problem. Suppose you calibrate a thermistorby inserting it first in ice water, then in boiling water. In icewater, the thermistor reads -32 mV and in boiling water it reads205 mV.
Neglect air resistance, as well as any energy absorbed by the pole, and clerify her altitude as she crosses the bar.
A ring of radius 5 cm is in the yz plane with its center at the origin. The ring carries a uniform charge of 10 nC. The electric potential at x = 12 cm is approximately
A car (m = 1,100 kg) is traveling at an initial speed of 12 m/s. It then slows to a stop over a distance of 86 m due to a force from the brakes. How much work is done on the car
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much horizontal force would you want to apply to a 4.0-lb plastic calculator to start it moving from rest.
The crane shown rotates at the constant rate ω1 = 0.25 rad/s; simultaneously, the telescoping boom is being lowered at the constant rate ω2 = 0.40 rad/s. Knowing that at the instant shown the length of the boom is 6 m and is increasing at the cons..
In a certain RLC circuit, the RMS current is 5.95 A, the RMS voltage is 238 V. Calculate the total reactance X = (XL - XC) in the circuit. Calculate the average power dissipated in the circuit.
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