You would like to balance a meter stick on your finger. The meter stick has a mass of m = 0.2 kg. (a) How far from the end should you place your finger to balance the stick? (b) Suppose two additional masses of M = 0.1 kg are placed at the positions x = 0 cm and x = 70 cm. Now where does your finger need to be placed to balance the meter stick?

## Determine the magnitude of the required net forceA 500 kg rocket sled can be accelerated at a constant rate from rest to 1500 km/h in 2.1 s. What is the magnitude of the required net force |

## What is the wavelength of the lowest frequency modeA 3.0 m organ pipe is open at both ends and contains air. The velocity of sound in air is 331 m/s. What is the wavelength of the lowest frequency mode in m |

## What is the acceleration of object sliding down that planeAn observer inside the building notices that it takes 0.15s for the tile to pass her window, whose height is 2.20m. How far above the top of this window is the roof. |

## By what factor is the magnitude of its momentum changedThe kinetic energy of an object is increased by a factor of 7, by what factor is the magnitude of its momentum changed |

## Find the friction force on the boxA coiled telephone cord forms a spiral with 56 turns, a diameter of 1.30 cm, and an unstretched length of 60.0 cm. Determine the self-inductance of one conductor in the unstretched cord. |

## What is the electric potential energy of the systemWhat is the electric potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)" Use = 8.85 10 12 for the permittivity of free space. |

## Obtain the force due to internal air pressure on each wallA cubic metal box with sides of 19 cm contains air at a pressure of 1 atm and a temperature of 253 K. Find the force due to the internal air pressure on each wall of the box |

## Boral is a commercial shielding material consistingBoral is a commercial shielding material consisting of approximately equal parts by weight of boron carbide (B4C) and aluminum compressed to about 95% theoretical density (2.608 g/cm3) and clad with thin sheets of aluminum 0.25 cm thick. The manuf.. |

## Obtain the magnitude of the velocity of the rockA rock is thrown from the roof of a building with a velocity v(0) at an angle alpha(0) of from the horizontal. Calculate the magnitude of the velocity of the rock just before it strikes the ground |

## What is the magnitude of the buoyant forceAn empty rubber balloon has a mass of 0.0120kg. The balloon is filled with helium at 0oC, 1atm pressure, and a density of 0.179kg/m3, What is the magnitude of the buoyant force acting on the balloon |

## Coefficient of kinetic friction between the box and the rampA box is pushed a distance d along a ramp at a constant speed by a horizontal force, Fa. The mass of the box is m. The ramp is inclined at an angle of ? above the horizontal. |

## What is the combined mass of both carsA 1000 kg car is moving at a constant speed of 7m/s when it hits the back bumper of another car with 1200 kg of mass moving in the same direction at a constant speed of 6 m/s. what is the combined mass of both cars |

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