A firefighter mounts the nozzle of his fire hose a distance 30.5 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. After quenching a hotspot at a height of 9.45 m, the firefighter adjusts the nozzle diameter so that the water hits the building at a height of 18.7 m. By what factor was the nozzle diameter changed? Assume that the diameter of the hose stays the same, and treat the water as an ideal fluid.

Explain what is the rate constant at 227 c : A rate constant obeys the Arrehnius equation, the factor A being 2.2 * 10^13 s-1 and the activation energy being 150 kj mol -1. What is the rate constant at 227 C, in s-1 |

Find what was the average angular speed of the ball : A soccer ball, which has a circumference of 70.0 , rolls 11.0 in 3.30. What was the average angular speed of the ball during this time |

Coefficient of kinetic friction between runners of sled-snow : A 20-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.6 m/s in 9.1 m. Find the coefficient of kinetic friction between the runners of the sled and the sn.. |

Explain polymerization of methyl methacrylate : In addition polymerization of methyl methacrylate, the benzoyl peroxide is an initiator. Why is benzoyl peroxide called an initiator and not a catalyst |

Calculate by what factor was the nozzle diameter changed : A firefighter mounts the nozzle of his fire hose a distance 30.5 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. By what factor was the nozzle diameter changed |

Case study - speedy tires : Using the random numbers which will be e-mailed to each group separately, manually simulate the depot operations with one bay and find the average waiting time of the 10 trucks? |

Explain the lewis dot structure be for 2cl molecule : What would the lewis dot structure be for 2Cl molecule + 2Iodied ion, and can you show me the polarity on both for reaction and after formation |

What is the work done by friction on the sled : a 10 kg sled slides down a snowy hill. At position A it is moving at 1.00 m/s when it reaches position B it is moving at 3 m/s. What is the work done by friction on the sled |

What is the tension in the left hand side wire : A 100 kg scaffold is 5.8 m long. It is hanging with two wires, one from each end. A 480 kg box sits 1.4 m from the left end. What is the tension in the left hand side wire?(g = 9.8 m/s2) |

## By what percent does the length of the legs decreaseA three-legged wooden bar stool made out of solid Douglas fir has legs that are 2.5cm in diameter.When a 65 man sits on the stool, by what percent does the length of the legs decrease |

## What does this fact tell us about earths interiorThe density of water in Earth's hydrosphere and the density of rocks in the crust are both lower than the average density of the planet as a whole |

## Calculate the force on a protonA dipole is located at the origin, and is composed of charged particles with charge +e and -e, separated by a distance 9 10-10 m along the y axis |

## Find the final temperature of the soupA 700 N window washer is standing on a uniform scaffold supported by a vertical rope at each end. The scaffold weighs 200 N and is 3 m long. what is the force in each rope when washer stands 1 m from one end. |

## What is the players speedA 70.5kg football player is gliding across very smooth ice at 1.75 m/s. What is the player's speed afterward if the ball is thrown at 12.5m/s relative to the player |

## Find the rms amplitude of the magnetic fieldAn electromagnetic wave produced by a dipole antenna is traveling in free space and has an rms electric field amplitude of 17 N/C. find the rms amplitude of the magnetic field |

## Determine the speet of the hoop and diskA hoop and a disk, both of 0.76- m radius and 3.0- kg mass, are released from the top of an inclined plane 3.0 m high and 7.0 m long. determine the speet of the hoop and disk |

## Find the torque acting on the coilA long piece of wire with a mass of 0.100 kg and total length of 4.00 m is used to make a suare coil with a side of 0.100 m. Find the torque acting on the coil due to the magnetic force at equilibrium |

## What is the area of the input pistonA hydraulic lift is used to jack a 920 kg car 42 cm off the floor. The diameter of the output piston is 18 cm, and the input force is 350 N. What is the area of the input piston |

## Calculate the impedance for given source frequencyA 63 ohms resistor, an 8.4 uF capacitor, and a 36 mH inductor are connected in series in an ac circuit. Calculate the impedance for a source frequency of 300Hz |

## Compute the initial speed of the bulletA bullet of mass 7.00g is fired horizontally into a wooden block of mass 1.21kg resting on a horizontal surface. compute the initial speed of the bullet |

## Find out the location of the imageA plane mirror and the concave mirror (f = 8.70 cm) are facing each other and are separated by a distance of 23.0 cm. An object is placed between the mirrors and is 11.5 cm from each mirror. |

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