According to the definition of work, the work done by an external force in moving a heavy crate along a horizontal surface should be the same whether the force is pulling upward at a 45 degree angle or pushing downward at a 45 degree angle. In practice it is easier to pull the crate than to push it at 45 degrees. Why is this so?

## At what rate should the current changeA 2.00-liter aluminum cylinder at 5°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 59°C, how much gasoline spills out. |

## Find how fast will automobile be traveling at that instantAt the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.0 m/s2. How fast will the automobile be traveling at that instant |

## Find the frequency heard by the listenerA sound source emits sounds of frequency 215 Hz that travel through still air at 340 m/s. Find the frequency heard by the listener |

## What is the max angle through which the load swingsA load of weight W is suspended from a cable of length L on a construction vehicle. What is the max angle through which the load swings |

## How do the final velocities of the balls compareA student at the top of a building throws a ball straight upward with an initial speed v0. How do the final velocities of the balls compare when they reach the ground |

## How many moles of helium are in the balloonA spherical balloon of volume 4.03 x10^3 cm3 contains helium at the pressure of 1.15 x10^5 Pa. How various moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x10-22 J. |

## Calculate with what initial velocity was it kickedA football is kicked 50.4 meters. If the ball is in the air 4.54 s, with what initial velocity was it kicked |

## Clerify her altitude as she crosses the barNeglect air resistance, as well as any energy absorbed by the pole, and clerify her altitude as she crosses the bar. |

## Compute the moment of inertia of the systemAn extremely light rod 1.00 m long has a 2.00-kg mass attached to one end and a 3.00-kg mass attached to the other. find the moment of inertia of the system about the fixed axis |

## What was the rocks velocity when it hit the waterA rock is dropped off the side of a bridge and hits the water below 5.7 s later. What was the rock's velocity when it hit the water |

## What is radial distance with a projectile reachesA pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing. |

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