The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole of radius 1.5 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the area of the hole?

## Find the new angular speed of the merry-go-roundA playground merry-go-round of radius R = 1.60 m has a moment of inertia I = 275 kg · m2 and is rotating at 8.0 rev/min about a frictionless vertical axle. What is the new angular speed of the merry-go-round |

## Question1a small plastic sphere of mass m 137 g isquestion1a small plastic sphere of mass m 137 g is attached to a string.there is an electric field of 174 nc directed |

## What is the average density of the fishThe average density of a fish can be found by first weighing it in air and then finding the scale reading for the fish completely immersed in water, what is the average density of the fish |

## What is the highest speed the rock can reachA 430 gram rock is whirled on the end of a string 45 cm long which will break under a tension of 22 N. What is the highest speed the rock can reach before the string breaks? (Neglect gravity.) |

## Define the magnitude of the electric field at a pointWhat is the magnitude of the contact force on the student by the backpack. |

## What is the average power delivered to the resistorA series ac circuit contains a 190 ohms resistor, a 14.0 mH inductor, a 4.50uF capacitor, and an ac power source of voltage amplitude 45.0 V operating at an angular frequency of 360 rad/s |

## Find the rate at which the field is changingA circular loop of wire of resistance R= .500 ohms and radius r=8.00cm is in a uniform magnetic field out of the page, Find the rate at which the field is changing |

## Compute what is their period of revolution in yearsIn a certain binary-star system, each star has the same mass which is 9.6 times of that of the Sun, and they revolve about their center of mass. What is their period of revolution in years |

## Find the acceleration of the bucketsuppose that the springs have somehow not yet compressed to their maximum amount. How much are the springs compressed. |

## Describe the term impulseHow many kilometers per liter will a car obtain if its engine is 25 percent efficient and it encounters and average force of 1000 Newtons? Suppose the energy content of gasoline is 40,000,000 joules per liter (J/L). |

## Calculate how much work is done on the crate by frictionA factory worker pushes a 28.4 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32degrees below the horizontal. How much work is done on the crate by friction during this displacement |

## Calculate how fast are the ions movingSingly ionized (one electron removed) atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. How fast are the ions moving when they emerge from the velocity selector |

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