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A Doppler ultrasound machine uses a probe emitting ultrasound waves at 5MHz to probe the speed of blood cells moving in an artery.
A) What is the wavelength through the soft tissue of ultrasound produced by this machine?
B) The machine detects a frequency change of 2000 Hz in the reflected waves. How fast is the blood flowing.
One side of the roof of a building slopes up at 37.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child.
A 0.2kg aluminum plate, initially at 20C, slides down at a 15.00 m long surface, incline at a 30 degree angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plane.
Use 9.81 for the magnitude of the acceleration due to gravity.
A person who weighs 680 N is riding a 98-N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 6.45 105 Pa, what is the area of contact between each tire and the ..
Calculate the amount of work (in electron-volts) it would take to move an electron from 11.6 to 13.4 away from a +3.50 point charge.
A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consisting of two protons, two neutrons, and no electrons).
Obtain a relation between the equilibrium lattice distance
Select all that apply. Which is the following statements is true?
a baseball pitcher throws a fastball across home plate. the ball crosses the plate, calculate the speed of a baseball that takes .010 s to cross home plate, .30 m from front to back
How much must this spring be stretched to store.
Two long, parallel wires, each having a mass per unit length of 40 g/m, are supported in a horizontal plane by strings 6.00cm long. When both wires carry the same current I.
What is the speed of the second asteroid? Now suppose that the first and second asteroids carry charges of 3.68 C and -3.68 C, respectively. How fast would the second asteroid have to be moving in order to occupy the same circular orbit as before?
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