Assume that a cement truck with a mass of 10,000 kg hits you while you were stopped at a traffic light, and that you are driving a Yugo with a mass of 750 kg. If the truck was traveling at 15 mph and the crash makes you stick together (you and the truck have the same final velocity), what is your final velocity? Ignore friction with the road. If the crash impact took 0.2 s, what was your average acceleration? Convert it to units of g, the acceleration of gravity. Solve the previous problem assuming you are in the cement truck instead of the Yugo. In which vehicle would you rather ride out the crash? Why How much kinetic energy was lost during the collision? What percentage of the initial kinetic energy of the truck was lost during the collision?

Use the left end of the bar as the fulcrum : A rod of length 0.850 m is attached to a pivot at one end. A force F of 2.30 N is applied to the end of the bar opposite the pivot. The force makes an angle of 65.0o with the bar. (The ? in the figure is the angle for the "line of action" of the f.. |

Cross-section of a hollow cylindrical conductor with radii : The cross-section of a hollow cylindrical conductor with radii a = 0.90 cm and b = 4.70 cm which carries a current 7.00 Amps uniformly spread over its cross-section. Find the magnitude of the magnetic field at a distance of 2.10 cm from the axis. |

A student sits on a rotating stool holding : A student sits on a rotating stool holding two 3.2-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus s.. |

Gasoline is made up of hydrocarbons : Gasoline is made up of hydrocarbons. Suppose 80% of mass of gasoline is carbon and all of this becomes CO2 in combustion. If the density of gasoline is 6.7 lb/gal, how much CO2 is emitted per gallon of gasoline burned? The atomic mass of carbon is 12.. |

Initial kinetic energy of truck was lost during collision : Assume that a cement truck with a mass of 10,000 kg hits you while you were stopped at a traffic light, and that you are driving a Yugo with a mass of 750 kg. If the truck was traveling at 15 mph and the crash makes you stick together (you and the.. |

For a coal gasification project being planned : For a coal gasification project being planned, 26,000 tons of coal per day is used to produce 250,000,000 cubic feet per day of natural gas. If the coal is rated at 8700 Btu/lb and the gas at 950 Btu/cubic ft, what will be the efficiency of this plan.. |

The solar insolation-what is the minimum area required : Suppose the solar insolation is 850 W/m2 and you can collect 20% of the energy that fall on the surface of a solar hot dog cooker. If you need 240 W to cook a hot dog, what is the minimum area required? |

Calculates the speed of the sports car at impact : A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m before stopping. The police officer, knowing that the coefficient of kinetic frict.. |

Find its velocity and find its acceleration : An object moves according to x = 3 m e^(-2/s t), y = 4 m sin(3/s t), z = -5 m cos(3/st) . a. Find its velocity. b. Find its acceleration. Note: s is seconds ex:-2/s means -2 per second and m is meters |

## Calculate how fast is the skier movingA 62.5 skier is moving at 6.00 on a frictionless, horizontal snow-covered plateau when she encounters a rough patch 3.10 long. How fast is the skier moving when she gets to the bottom of the hill |

## Find the average speed for the second quarterA ball rolling down an incline travels 6 cm in the first .25 seconds, and 24 cm in the first .50 seconds. find the average speed for the second quarter second time interval |

## Find the magnitudes of the net force acting on the electronAn electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. Find the magnitudes of the net force acting on the electron |

## Compute how fast is dan going as his feet hit the groundDan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground |

## Calculate the speeders speed with respect to the groundA speeder is pulling directly away and increasing his distance from a police car that is moving at 23.0 m/s with respect to the ground. Calculate the speeder's speed with respect to the ground. |

## Determine the angular acceleration of the rodA thin uniform rod (length = 1.29 m, mass = 1.95 kg) is pivoted about a horizontal frictionless pin through one of its ends. What is the angular acceleration of the rod at the instant it is released |

## Find the energy of a photonFind the energy of a photon that is emitted when an electron in a hydrogen atom undergoes a transition from the n=7 level |

## Nearby stars to exert gravitational force on himAn astronaut accidentally gets separated out of his small spaceship accelerating in inter stellar space at a constant rate of 100 m s-2. What is the acceleration of the astronaut the instant after he is outside the spaceship ? (Assume that there a.. |

## Calculate the speed of the each ball after collisionA 500g ball moving at (10.0cm/s, +x) collides with an identical ball at rest.The incoming ball scatters at 30 degrees with respect to the +x axis, What is the speed of the each ball after collision |

## Should they attempt to return to the airstripA fuel leak is discovered at this point, and crew calculates that the plane can safely fly no more than 170 km before an emergency landing should be attempted. The only appropriate location for an emergency landing is 100 km north of their current po.. |

## Determine the magnitude of the net electric fieldFour point charges have the same magnitude of 2.4 X 10^-12 C and are fixed to the corners of a square that is 4.0 cm on a side. Determine the magnitude of the net electric field |

## Find by how many celsius degrees should the rod be cooledA commonly used method of fastening one part to another part is called "shrink fitting." By how many Celsius degrees should the rod be cooled |

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