Ultrasound is the name given to frequencies above the human range of hearing, which is about 20,000 hz. waves above this frequency can be used to penetrate the body and produce images by reflecting from surfaces. in a typical ultrasound scan, the waves travel with a speed of 1,809 m/s. for a good detailed image, the wavelength should be no more than 1.44 mm. what frequency is required?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).