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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?
A particle has initial velocity 5 m/s due east and acceleration 2 m/s^2 due west. Find the distance traveled during 3rd second of the motion.
The speed of sound does not depend on the loudness or the frequency of sound. Explain how temperature and humidity affect the speed of sound
A bird stands on a dc electric transmission line carrying 3200A. What is the potential difference between the bird's feet
A 2.93kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 9.83kg cylindrical pulley, Find the angular acceleration of the pulley
A football is thrown at a speed of77 mph at a wall that is 52 ft away. Upon colliding with the wall thefootball exerts 43 lb of force due north onthe wall. How much force does the wall exert on the football and in what direction?
Your 12-kg baby sister pulls on the bottom of the tablecloth with all her weight. On the table, 59cm from each edge, is a 5.8-kg roast turkey. What's the turkey's acceleration
A gold prospector finds a solid rock that is composed solely of quartz and gold. The mass and volume of the rock are, Find the mass of the gold in the rock
A power boat of mass 500 kg iscruising at a constant speed of 8.9 m/s. The propeller provides adrive force of 765 N. How far does the boat coast
An "energy bar" contains 21g of carbohydrates. If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr? Express your answer using two significant figures.
In the 1950s, an experimental train that had a mass of 2.00 104 kg was powered across a level track by a jet engine that produced a thrust of 5.30 105 N for a distance of 509 m. Find the work done on the train
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 9.6 m and, in starting, rotates according to ? = 0.34t^2, find the magnitudes of the astronaut's angular velocity
An arbitrary mass of 0.200 kg is connected to a light spring with force constant 5 N/m and is free to oscillate on a horizontal, frictionless surface. What is the maximum speed of the mass
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