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Suppose that you'd like to find out if a distant star is moving relative to the earth. The star is much too far away to detect any change in its brightness as it moves toward or away from the earth. Instead we can use the Doppler effect to determine its relative speed. For this problem we are going to look at the spectral lines from hydrogen, specifically the one with a wavelength of 656.46 nm. Part B What is , the speed at which the star is moving relative to the earth? Express your answer as a fraction of the speed of light to two significant figures. Part C Suppose that you measured a peak at 680 nm instead. What is the relative speed of the star to the earth in this case? Express your answer as a fraction of the speed of light to two significant figures. Part E The hydrogen atoms in a star are also moving at high velocity because of the random motions caused by their high temperature. As a result, each atom is Doppler shifted a little bit differently, leading to a finite width of each spectral line, such as the 656.46-nm line we were just discussing. For a star like our sun, this leads to a finite width of the spectral lines of roughly . If our instruments can only resolve to this accuracy, what is the lowest speed , greater than 0, that we can measure a star to be moving? Express your answer in kilometers per second to two significant figures.
A 800 kg car is travelling forwards at + 25 m s?1 along a level road. What is the acceleration during skidding
questiona 170g copper bowl contains 200g of water both at 21c. a very hot 490g copper cylinder is dropped into the
A 1.2kg block slides along a frictionless surface at 1.5m/s . A second block, sliding at a faster 4.8m/s, what is the mass of the of the second block
At one instant, a 19.0-kg sled is moving over a horizontal surface of snow at 5.00 m/s. find the magnitude of the average friction force acting on the sled while it was moving
A spring has of constant k=1200 N/m is compressed by 8.0cm. A 2.5kg block is placed against the compressed spring. find the resulting kinetic energy and speed of the block
a golf ball rolls up a hill toward a miniature golf hole. assume that the direction toward the hole is positive. if the
A beam of light is traveling in air and strikes a material. The angles of incidence and refraction are 58.8°, Obtain the speed of light in the material
Discuss the meaning of a four-dimension space-time in relation to the Lorentz transformation. What is the geometry of this space-time called. What is the four-dimensional measure of the duration in space-time
A skier of mass m= 70kg glides down a slope at angle theta= 32 degrees, as shown in the figure below. The snow is so slippery that you can neglect friction. Find the force the snow exerts on the skier
ject located at the origin and having mass M explodes into three pieces having masses M/6, M/3, and M/2. What are the velocity components of the third piece
When a certain spring is stretched by an amount x, it produces a restoring force of F(x) = ax=bx^2, where a and b are constants. How much work is done through an external force in stretching the spring by an amount D from its equilibrium length.
A gas consists of 5.05 grams of oxygen and 5.05 grams of nitrogen and occupies a volume of 1.22 liter at a temperature of 370 K. Find the partial pressure of the oxygen
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