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A Doppler blood flow unit emits ultrasound at 5.0MHz. What is thefrequency shift of the ultrasound reflected from blood moving in anartery at a speed of 0.20 m/s?
A 10 g bullet traveling at 440m/s strikes a 7.0kg , 1.2-m-wide door at the edge opposite the hinge. What is the angular velocity of the door just after impact
A nuclear power plant generates 2000 MW of heat energy from nuclear reactions in the reactor's core. determine the possible thermal efficiency of the power plant
Two girls are sitting on the same side of a see-saw. One girl is 28 kg and sitting 2.4 m away from the middle. The other girl is 35 kg and 2.6 m away from the middle. Their dad can balance them out if he sits 2.0 m away from the middle on the other s..
A meterstick moving at 0.888c relative to the Earth's surface approaches an observer at rest with respect to the Earth's surface. What is the meterstick's length as measured by the observer
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 1.80e28 kg and 1.60e3 m. Find the density of such a star
A 0.390 kg iron horseshoe that is initially at 745 °C is dropped into a bucket containing 24 kg of water at 46 °C. What is the final equilibrium temperature? Overlook any heat transfer to or from the surroundings.
What distance does baseball move before its release
A 2.05 g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1.26 ?C. How many electrons were removed from the ping-pong ball
A spring with spring constant 12.5 hangs from the ceiling. A 400 ball is attached to the spring and allowed to come to rest. It is then pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57.0 ..
A massless spring hangs from the ceiling with a small object attached to its lower end. How far below yi is the new equilibrium (rest) position with both objects attached to the spring
Unpolarized light with an intensity of 980 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
At what energy does an electron become "relativistic"? Consider electrons with kinetic energies of 50 eV, 50 keV, and 50 MeV. When is it important to use the relativistic formulas
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