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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?
You (mass 55 kg) are riding your frictionless skateboard (mass 5.0 kg) in a straight line at a speed of 4.7m/s, What is your new speed, while holding the flour sack
Suppose 79kW is to be transmitted over two 0.105ohms lines. Estimate how much power is saved if the voltage is stepped up from 200V to 2000V and then down again, Estimate how much power is saved
an electron is shot directly toward the center of a large metal plate that has surface charge density -1.00 × 10-6 C/m2. how far from the plate must the launch point be
A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.52). White light is incident normal to the film. Calculate the thickness of the acetone film
An electron traveling horizontally to the right enters a region where a uniform electric field is directed downward. What is the direction of the electric force exerted on the electron once it enters the electric field? A. to the left B. to the ri..
A skier finds that she must give hersel a push to get started down ski slopes with angles less than 8 degrees. What is the coefficient of static friction between the skis and the snow
a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incline
Create horizontal component of the pendulum
The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with an acceleration of -5.60 m/s^2 for 4.20s, making straight skid marks 62.4m long ending at the tree. At what speed does it hit the tree?
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision and are going 10 m/s after the collision
Two charges, -3.5?C and -4.4?C , are located at (-0.70m , 0) and (0.70m , 0), respectively. find the location of the point where the electric field is zero
The EEG. Physicians use electroencephalograms (EEGs) to study electrical oscillations in the human brain. What's the corresponding range in periods
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