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.

Final velocities of ball if collision is perfectly inelastic : Ball 1, with a mass of 110 and traveling at 14.0 , collides head on with ball 2, which has a mass of 320and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic? What are the final velocities of each .. |

Determine the coefficient of kinetic friction : Your favorite physics book (total mass 2.4kg) is pushed across the floor at a constant speed by a force of F = 26N at an angle (theta)= - 42 degrees (aiming downward 42 degrees below the horizontal). Determine the coefficient of kinetic friction ? k .. |

A ring is fitted loosely around a long : A ring is fitted loosely (with no friction) around a long, smooth rod of length L = 0.561 m. The rod is fixed at one end, and the other end is spun in a horizontal circle at a constant angular velocity of ? = 3.57 rad/s. |

Cause more serious burns than water at the same temperature : Steam can cause more serious burns than water at the same temperature. Here we want to examine this effect quantitatively, noting that flesh becomes badly damaged when its temperature reaches 50.0 oC. |

Find out if a distant star is moving relative to the earth : 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 determi.. |

During an adiabatic process and the temperature : During an adiabatic process, the temperature of 3.92 moles of a monatomic ideal gas drops from 485 oC to 205 oC. For this gas, find (a) the work done by the system, (b) the net change in internal energy of the system, and (c) the net heat absorbed by.. |

Determine the height of the image and describe the image : An object 0.600 cm tall is placed 17.0 cm to the left of the vertex of a concave spherical mirror having a radius of curvature of 24.0 cm. determine the height of the image and describe the image. upright/virtual / real/ inverted/ enlarged/ behind th.. |

What are the position and magnification of its image : An object is 28.0 cm from the center of a silvered spherical glass Christmas tree ornament 6.50 cm in diameter. What are the position and magnification of its image? (Use the correct sign conventions.) position _______________cm from the surface imag.. |

Compared to the weight of the elevator-tension in the cable : Consider an elevator that is hanging from a strong cable. The elevator is initially at rest. It then accelerates upwards for 2 seconds, due to the cable pulling. It then then slows down, still moving upwards, until it comes to a stop. Pick out any.. |

## Determine the volume of the bubbleAn air bubble has a volume of 1.65 cm3 when it is released by a submarine 115 m below the surface of a lake. What is the volume of the bubble |

## Find their velocity just after the collisionA 0.0280 kg bullet moving horizontally at 500 m/s embeds itself into an initially stationary 0.500 kg block. What is their velocity just after the collision |

## How far from where it is thrown will the ball landA ball is thrown from the ground with a speed of 30m/s at an angle of 55 degree above the horizontal. If we neglect air resistance, How far from where it is thrown will the ball land |

## What is the speed of the bob at the bottom of the swingA 2.4 m long pendulum is released from rest when the support string is at an angle of 25° with the vertical. What is the speed of the bob at the bottom of the swing |

## What is the position of the third closest imageTwo plane mirrors stand facing each other, 2.79 m apart, and a woman stands between them. What is the position of the third closest image |

## What is the angular acceleration of the engineA car engine is initially rotating at 60 rad/s. It is then turned off and takes 5.00 s to come to a complete stop. What is the angular acceleration of the engine? Assume acceleration is constant. |

## Question1two speakers one directly behind other are eachquestion1two speakers one directly behind other are each generating a 268-hz sound wave. what is the least separation |

## Find the magnitude of the acceleration of the massesA 3.00kg mass and a 5.00kg mass hang vertically at opposite ends of a rope that goes over an ideal pulley. what is the magnitude of the acceleration of the masses |

## What was the original speed of the particleA particle is moving with a certain speed. Its speed and momentum are being measured with respect to Earth. What was the original speed of the particle |

## Find the pressure on the windowIn a 30.0 s interval, 540 hailstones strike a glass window of area 0.600 m2 at an angle of 45.0° to the window surface. Find the pressure on the window |

## Determine force is exerted by the water on the windowWhat force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 35.7 cm |

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