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In a laboratory, a wavelength of a particular hydrogen emission line (Balmer beta line) is observed as 486.1 nm. If the same emission line appears in a star's spectrum at 486.3 nm, what is the stars radial velocity ? Is it approaching or receding?
electric circuits can be defined as closed or continuous paths in which electric currents are confined and around
A simple pendulum of length 2.00 m is made with a mass of 2.00 kg. What is the maximum angle away from the lowest position the pendulum will reach
A small fan has blades that have a radius of 0.0600 m. When the fan is turned on, the tips of the blades have a tangential acceleration of 19.6 m/s2as the fan comes up to speed
A spear fisherman is using m a laser rifle, he is standing in a stream 0.5m deep, if the laserstruck the water 5m out from the fisherman, how far was his feet from the fish
A ball rolls horizontally with a speed of 9.0m/s off the edge of a tall platform. what is the height of the platform
As your bus rounds a flat curve at constant speed, a package with mass 0.300kg , suspended from the luggage compartment of the bus by a string 50.0cm long, What is the speed of the bus
questionone of the methods used to train astronauts for the effects of zero gravity in space is to put them in a
A ceiling fan with 82cm diameter blades is turning at 70rpm. Suppose the fan coasts to a stop 29s after being turned off. Illustrate what is the speed of the tip of a blade 10s after the fan is turned off?
A block of mass m1 = 0.57kg is placed on top of another block of mass m2 =0.97kg, What minimum coefficient of static friction between the two blocks will prevent the upper one from slipping
A student is looking at a monochromatic light source and is looking for the third bright fringe. At what angle should the student look for the third bright fringe
A circular solenoid contains 100 turns of wire and carries a current of 2 amps. Its radius is 1 cm and its length is 10 cm. Calculate the magnetic flux through one turn of the wire
during heavy rain a section of a mountainside measuring 3.8 km horizontally perpendicular to the slope 0.44 km up along
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