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The piezoelectric transducers of the ultrasound machine generatefrequencies of 7.4 MHz and 10.5 MHz. Assuming that one wavelength is the size of the smallest object that can be imaged,
what is the minimum size the machine can detect? (Give your answerin millimetres to two significant figures.)
A 30-g silver teaspoon at room temperature 200C is placed into 200 g of hot tea 1000C. No heat escapes the spoon-tea system. You assume that the specic heat of tea is the same as that of water.
A 5 kg box rests on a table. Amassless string in attached to the box and is hung over a massless, frictionless pulley. find the force that the table exerts on the box
A solenoid 10.0 cm in diameter and 69.9 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. What power must be delivered to the solenoid
A 14.5 gram, 78.6 centimeter long steel guitar string is vibrating in its fourth harmonic. What is the tension on the steel guitar 'string'
A series RCL circuit is comprised of a 3.00-mH inductor and a 5.00-µF capacitor. What is the resonant frequency of this circuit
Some birthmarks can be removed by exposure to 585 nm laser light. Pulses are strongly absorbed by hemoglobin in the capillaries in the birthmark, What is the power of the laser pulse
The earth has a radius of 6.38 x 106 m and turns on its axis once every 23.9 h. (a) What is the tangential speed (in m/s) of a person living in Ecuador, a country that lies on the equator? (b) At what latitude (i.e., the angle in the figure, in degre..
in a harmonic pendulum, the lengths are increasing monotonically; the lengths are measured so that in a defined set of oscillations (i.e. 20 cycles in 20 seconds), what are a set of lengths that would work
A solid cylinder of radius r1 = 3.0 cm, length h1 = 6.0 cm, emissivity 0.87, and temperature 35°C is suspended in an environment of temperature 64°C. What is the cylinder's net thermal radiation transfer rate
A billiard ball moving at 5.80 m/s strikes a stationary ball of the same mass. find the struck ball's velocity after the collision
A dolphin located in seawater at a temperature of 25 °C emits a sound directed toward the bottom of the ocean 200m below. How much time passes before it hears an echo.
A very long solenoid with a circular cross section and radius r= 8.10 cm with n= 1.50E 4 turns/m has a magnetic energy density uB= 6.40 mJ/m3. What is the total energy stored in the solenoid
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