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Physicians use a high-frequency (f = 1-5 MHz) sound waves,called ultrasound, to image internal organs. The speed ofthese ultrasound waves is 1480 m/s in muscle and 344 m/s inair. At what angle from the normal does an ultrasound beamenter the heart wall if it leaves the lungs at an angle of 9.73degrees from the normal to the heart wall? Assume the speedof sound in the lungs is 344 m/s. What is the critical agle for sound waves in air incident on muscle?
Suppose that you pull on the rope OA shown in the figure, exerting a 50 N force F at O. What are the force vectors
A balloon is filled with 5.00 liters of helium at a pressure of 1.20 atm and a temperature of 27.0 degrees C. Find the mass of the helium
You are standing on a scale inside an elevator. The scale reads 112 percent of your weight. What is the acceleration of the elevator
An athlete competing in the hammer throw swings a 4.0 kg hammer on a chain in a horizontal circle with a 5.4 m diameter. What is the tension in the chain attached to the hammer at that speed
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
A small glass bead has been charged to + 30{rm nC} . a)What is the magnitude of the acceleration of a proton that is 3.0{rm cm} from the center of the bead? b)What is the magnitude of the acceleration of an electron that is 3.0{rm cm} from the cen..
Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Identify the average force that the water exerts on the diver. This force is nonconservative.
A 150 g glider on a horizontal, frictionless air track is attached to a fixed ideal spring with force constant 180 N/m. What is the angular frequency of the oscillations
A diverging lens with f = -24.5 cm is placed f= 13.5 cm behind a converging lens with f = 20.0 cm. Where will an object at infinity be focused
Two scales on a voltmeter measure voltages up to 20.0 V and 28.0 V, respectively. Determine the coil resistance
An electric motor turns a flywheel through a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel as shown in the figure below. The flywheel is a solid disk with a mass of 57.0 kg and a radius R = 0.625 m...
The bullet remains in the block, and after the impact the block lands d = 1.90 m from the bottom of the table. How much time does it take the block to reach the ground once it flies off the edge of the table.
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