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A mad doctor believes that baldness can be cured by warming the scalp with sound waves. His patients sit underneath the Bald-o-Matic loudspeakers, where their heads are bathed with 91dB of soothing 800Hz sound waves. Suppose we model a bald head as a 16-diameter hemisphere. If 0.23 of sound energy is considered an appropriate "dose," how many minutes should each therapy session last? Answer time in minutes
a 47.5-g super ball traveling at 25.5 ms bounces off a brick wall and rebounds at 21.0 ms. a high-speed camera records
A meterstick of negligible mass has a 0.25 kg mass at its 31 cm mark and a 0.40 kg mass at the 77 cm mark. Where should the fulcrum be so the meterstick is balanced
Two satellites are in circular obits about earth. one is 150 kmabove the surface, the other 160 km. A)which satellite has thelarger orbital period? B)which one has the greater speed?
A petite young woman distributes her 550{\rm N} weight equally over the heels of her high-heeled shoes. Each heel has an area of 0.650{\rm cm^2}. What pressure is exerted on the floor by each heel
In a particular crash test, an automobile of mass 1621 kilogram collides with a wall and bounces back off the wall. obtain the magnitude of the impulse due to the collision
An electromagnetic wave with frequency 65.0Hztravels in an insulating magnetic material that has dielectric constant 3.64 and relative permeability 5.18 at this frequency. What is the speed of propagation of the wave
An empty parallel plate capacitor is connected between theterminals of a 7.5-V battery and chargedup. The capacitor is then disconnected from the battery, and thespacing between the capacitor plates is doubled.
A 2.50m -long, 550g rope pulls a 6.00kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.30m/s2. How much force pulls forward on the rope
Sam (85kg) takes off up a 50-m-high, 10 degrees frictionless slope on his jet-powered skis. The skis have a thrust of 220N. He keeps his skis tilted at 10 degrees after becoming airborne.
A 1890 kg truck traveling north at 45 km/h turns east and accelerates to 51 km/h. What is the change in the truck's kinetic energy
charges are placed on an equilateral triangle all angles are equal and equal to 60 degrees. the length of each side of
An object is placed 6.00cm to the left of a converging lens of focal length 8.00 cm. obtain the position of the final image
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