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A wave has a wavelength of 6 mm and a frequency of 12 hertz. What is its speed? mm/s
What is the wavelength of an earthquake wave if it has a speed of 13 km/s and a frequency of 13 Hz?
If lithium ion Li+2 is treated as a classical system of one electron of charge ?e going around a nucleus of charge 3e on a circle of radius 1.77× 10?11 m
What diameter must a helium filled balloon have to float with neutral buoyancy? The mass of the empty balloon is 2.0g
A hot-air balloonist, rising vertically with a constant velocity of magnitude v= 5.00 m/s, releases a sandbag at an instant when the balloon is a height h= 40.0 m above the ground. What is the greatest height above the ground that the sandbag reach..
A long solenoid with 10.0 turns/cm and aradius of 7.00 cm carries a current of28.0 mA. A current of 5.00 A exists in a straight conductor located alongthe central axis of the solenoid.
The laws of reflection and refraction are the same for sound and for light. The speed of sound is 340 m/s in air and 1510 m/s in water. If a sound wave that is traveling in air approaches a flat water surface by an angle of incidence of 10.3°, what i..
The flywheel of an engine has a moment of inertia 2.80 {rm kg} cdot {rm m} ^ {2} about its rotation axis. What is its final kinetic energy.
A 1280 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. Calculate the magnitude of the tension in the wire.
What must be the initial velocity of superman to catch Vince just before Vince reach the ground - what must be the height of skyscraper so that even superman cannot save Vince when came in five seconds later?
a stone is trown vertically downward at an initial speed of 14ms from a height of 65m above the ground.how far does the
Consider the transitions 3d -->2p in hydrogen. Calculate the possible energies of emitted photons, How many photon lines are there
A rubber ball of mass 27.5 g is dropped from a height of 1.85 m onto a floor. What impulse was applied to the ball during the collision
An air-gap 75 mF capacitor has plates separated by 14 mm with an electric field between them of 5.6x105 V/m. How much charge is on the plates?
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