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A 2.40 MHz sound wave travels through a pregnant lady'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 85 beats per second are detected. The speed of sound in body tissue is 1520 meter per second.
a) Find the speed of the fetal heart wall at the instant this measurement is made.
two point charges are placed along a horizontal axis with the following values and positions 4 microc at x 0 cm and -
an aluminum tray used for making ice cubes is filled with water and placed in a freezer at -19.8deg c. the emissivity
a police camera is designed to read the plate number on a speeding car. what is the diameter of the camara's aperture
Illustrate at what angle should a curve of radius 140 m be banked, so cars can travel safely at 33 m/s without relying on friction?
A uniform metal rod, with a mass of 3.4 kg and a length of 1.3 m, is attached to a wall by a hinge at its base. Find the vertical component of the force exerted on the rod by the hinge
A spring is hung from a ceiling, and an object attached to itslower end stretches the spring by a distance of 5.00 cm from itsunstretched position when the system is in equilibrium. determine the mass of the object
A hang glider and its pilot have a total mass equal to 120kg.While executing a 360 degree turn, the glider moves in a circlewith an 8-m radius. What is the net force on the hang glider
A carbon dioxide laser emits a sinusoidal electromagnetic wave that travels in vacuum in the negative x-direction, Write vector equations for E and B as functions of time and position
a 2.00 g plastic bead charged to -4.00 nc and a 4.00 g glass bead charged to 8.00 nc are 2.00 cm apart center to
A 0.800-kg block oscillates on the end of a spring whose spring constant is k = 42.0 N/m. What is the fractional decrease in amplitude per cycle
What is the approximate radius of Earth? Its mass is 6.0*10^24 kilograms and the acceleration due to gravity at its surface is 9.8 m/s2
q1. a street lamp weight 164n. it is supported equally by two wires that form an angle of 129 degrees with each other.
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