A cylindrical aluminum rod, with an initial length of 0.8200 m and radius 1200.0 µm, is clamped in place at one end and then stretched by a machine pulling parallel to its length at its other end. Assuming that the rod's density (mass per unit volume) does not change, find the force magnitude that is required of the machine to decrease the radius to 1199.9 µm. (The yield strength is not exceeded.)

## How many times greater is the speed of sound in the railHave you ever listened for an approaching train by kneeling next to a railroad track and putting your ear to the rail. how many times greater is the speed of sound in the rail than in the air |

## Kinetic energy of an emitted alpha particleGiven the minimum kinetic energy of an alpha particle in nucleus= 0.01304 Mev or 2.09*10^-15 J compare this to the kinetic energy of an emitted alpha particle (5 MeV or 8.010883 *10-13 J), is it possible the alpha particle could have existed inside t.. |

## Determine the change in the systems kinetic energyA 1 022-kg satellite orbits the Earth at a constant altitude of 91-km. What is the change in the system's kinetic energy |

## What was the initial kinetic energy of the systemA car of mass 1200kg is heading east at 10m/s. A second car of mass 1500kg is heading west at 20.0m/s. They meet in an elastic collision. What was the initial kinetic energy of the system |

## By what length is the spring extendedA block of mass m = 4 kg slides back and forth on a frictionless horizontal track. It is attached to a spring with a relaxed length of L = 4 m, By what length is the spring extended |

## What is the average density of the full gas canA 2.00 kg steel gas can holds 10.0 L of gasoline when full. What is the average density of the full gas can |

## What is the mass of the volleyballWhen spiking a volleyball, a player changes the velocity of the ball from 4.0m/s to -28m/s along a certain direction. what is the mass of the volleyball |

## Compute the density of entropically raised element of airCompute the density of entropically raised element of air |

## Determine the angle hill inclined above the horizontalA 1940-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 32.2 m/s. At what angle is the hill inclined above the horizontal |

## Identify the magnitude and direction of the resultant magnetdirected into the plane of the computer screen as shown in the figure. Identify the magnitude and direction of the resultant magnetic field at P. |

## Difference between the electrodes after original electronTwo 11cm diameter electrodes 0.50cm apart form a parallel-plate capacitor. The electrodes are attached by metal wires to the terminals of a 15V battery. After a long time, the capacitor is disconnected from the battery but is not discharged. |

## Calculate puck final speedTwo pucks collide on an air hockey table. Puck A has a mass of 30 g and is initially traveling in the +x direction at 6.0 m/s. Calculate puck A's final speed |

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