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A 1.80 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 87 beats per second are detected. The speed of sound in body tissue is 1500 meter per second.
A. Determine the speed of the fetal heart wall at the instant this measurement is made.
A crate is dragged 3m across a rough floor at a constant speed by a worker applying 500N at an angle of 30 deg above the horizontal. How many forces act on the crate
is an adiabatic process and example of a quasi-static process? please explain throughly. i know an adiabatic process
What is the charge before the Teflon is removed? B.)What is the potential difference before the Teflon is removed, What is the charge after the Teflon is removed
How does an electroscope work? I have a homework problem that is asking me to sketch an arrangement of excess positive or negative charges in various regions on a picture of an electroscope (that is positiv charged) to show what happens to the charg..
problem- building office room. length 10m width 8m height 4m. four pillars support four beam. the beams should have
1200 kg car at velocity 25m/s brakes and stop moving after 40m. What is the coefficient friction between the tires and road
An object 3.25 cm high is placed 18.7 cm in front of a convex mirror with radius of curvature of 8.35 cm. Where is the image formed
a battleship simultaneously fires two shells toward two identical enemy ships. one shell hits ship a which is close by
a horizontal meter stick has a mass of 213 g. three weights ride on the meter stick 263 g at 41.5 cm 181 g at 77.3 cm
A bicycle wheel of radius 0.4 m is spinning at a rate of 65 revolutions per minute. find the centripetal acceleration of a point on the edge of the wheel
After falling from a rest from a height of 30 m, a 0.50-kg ball rebounds upward, reaching a height of 20 m. If the contact among ball and ground lasted 2.0 ms, what average force was exerted on the ball?
question a proton is accelerated through a potential difference of 150v. it then enters a region of uniform magnetic
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