When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. This pressure causes the force that pushes the bullet through the barrel. Suppose the barrel has a length of 0.511 m and an opening whose radius is 2.55 x 10-3 m. A bullet (mass = 2.6 x 10-3 kg) has a speed of 433 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expanding gas.

Explain calculate the mass of nh3 produced : Hydrogen and nitrogen react to form ammonia, NH3. Calculate the mass of NH3 produced from the reaction of 14 g N2 and 1.0 g H2. |

Consider a statistical insignificance test : An article in Marketing News (T.T. Semon, "Consider a Statistical Insignificance Test," Marketing News, February 1, 1999) argued that the level of significance used when comparing two products is often too low--that is, sometimes you should be using .. |

Explain aluminum metal reacts with sulfuric acis : Aluminum metal reacts with sulfuric acis, H2SO4, to yield aluminum sulfate and hydrogen gas. Calculate the mass of aluminum metal needed to produce 13.2g hydrogen. |

Explain how many kilojoules of heat are released : How many kilojoules of heat are released when 38.3 g of CH_4(g) reacts completely with O_2(g) to form CH_3)H(g) at constant pressure |

Determine the average pressure of the expanding gas : When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. determine the average pressure of the expanding gas |

What is the specific heat capacity of the other substance : Two bars of identical mass are at 32 °C. One is made from glass and the other from another substance. What is the specific heat capacity of the other substance |

Explain how many grams of methane gas are produced : For a given sample of CH_3OH, the enthalpy change during the reaction is 82.1 kJ. How many grams of methane gas are produced |

Find the ratio of the mass of steam to the mass of ice : Ice at -10.0 °C and steam at 118 °C are brought together at atmospheric pressure in a perfectly insulated container. find the ratio of the mass of steam to the mass of ice |

What is the year-end 2012 balance in accounts receivable : Mr. Husker's Tuxedos Corp. ended the year 2012 with an average collection period of 39 days. The firm's credit sales for 2012 were $56.8 million. |

## What is the average net force on the carA cue ball hits a stationary eight ball on a pool table. For which of the following systems is there a change in momentum during the collision? define why. |

## Find out the position (in m) at time t = 5.67 sA jetliner is moving at a speed of 216 m/s. The vertical component of the plane's velocity is 79.70 m/s. establishes the magnitude of the horizontal component of the plane's velocity. |

## What is the final temperature of cadmiumsuppose that the cross section of the hose opening is circular with a radius of 1.5 centimeters. |

## How much work is done by the rope on the sledA sled is dragged along a horizontal path at a constant speed of 1.5 m/s by a rope that is inclined at an angle of 30.0Â° with respect to the horizontal, How much work is done by the rope on the sled |

## Compute the original speed of the bulletA 690 g wood block is at rest on a frictionless table, when a 27 g bullet is fired into it. what was the original speed of the bullet |

## Find a symbolic expression for the electric potentialThree identical point charges each of charge q are located at the vertices of an equilateral triangle, Find a symbolic expression for the electric potential at the center of the triangle |

## How much higher, did the skeet go upA 0.25 kg skeet (clay target) is fired at an angle of 28 degrees to the horizon with a speed of 25 m/s. |

## What are the input heat and rejected heatMultiple-Concept Example 6 provides a review of the concepts that play roles here. What are the input heat and rejected heat |

## What is the velocity of the massA 1248.0 g mass is on a horizontal surface with ?k = 0.36, and is in contact with a massless spring with a force constant of 790.0 N/m which is compressed, What is the velocity of the mass as it loses contact with the spring |

## Find the speed of the moving chargeTwo identical 30 {rm g} particles each carry 3 {rm mu C} of charge. One is held fixed, and the other is located 1 {rm mm} away and released. Find the speed of the moving charge when it's 1{rm cm} from the fixed charge. |

## Determine the angular speed of diskA disk 8.00 cm in radius rotates at a constant rate of 1,200 rev/min about its central axis. Determine its angular speed in radians/sec |

## Find at what angle from the vertical was the bombsight setThe plane has a telescopic bombsight set so that the bomb hits the target seen in the sight at the moment of release. At what angle from the vertical was the bombsight set |

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