The intensity due to a number of different sources is the sum of the individual intensities.

a. When all of the Octomom's octuplets cry simultaneously, how many decibels greater is the sound level than when one baby cries?

b. To increase the sound level by the same number of decibels, how many additional babies would be required?

Explain the activation energy for the reverse reaction : What would be the activation energy for the reverse reaction in the presence of a catalyst that decreased the activation energy for the forward reaction to 107 kJ/molrxn |

Explain 3-methyl-2-butanone to 2-methyl-3-hexanone : Show the different ways to convert 3-methyl-2-butanone to 2-methyl-3-hexanone. Then show the product that forms when 3-phenylpropanal is allowed to mix with sodium hydroxide catalyst. |

What is the elastic modulu of this wire : a wire has a diameter fo .200mm and stretches .20% when a force of 6.28N is applied to it. what is the elastic (Young's) modulu of this wire |

Depict how to synthesize 2-methyl-2-pentene : Show how to synthesize 2-methyl-2-pentene from an alkyl halide and an aldehyde or ketone, plus any other necessary reagents. Then show the reagents necessary to convert butyraldehyde into the following. There may be one more step |

Determine how many additional babies would be required : The intensity due to a number of different sources is the sum of the individual intensities. how many additional babies would be required |

Explain the calculation is based on the fact : The age of a rock can be estimated by measuring the amount of 40Ar trapped inside. The calculation is based on the fact that 40K decays to 40Ar by a first-order process. It also assumes that none of the 40Ar produced by the reaction has escaped fr.. |

Calculate what is the radius of its circular orbit : If an electron moves perpendicular to the same magnetic field with this same translational speed, what is the radius of its circular orbit |

Estimate what fraction of its kinetic energy is rotational : An 6.60-cm-diameter, 300 sphere is released from rest at the top of a 1.70-m-long, 20.0 incline. It rolls, without slipping, to the bottom. What fraction of its kinetic energy is rotational |

What color is the light reflected from the plate : A chain of movie theaters is decorated with light fixtures that when the white light passes through a transparent plate, it becomes yellow light. What color is the light reflected from the plate |

## How fast is it moving when it hits the sidewalka student drops a ball from a window 3.5m above the sidewalk. how fast is it moving when it hits the sidewalk |

## For what distance does she have to run in that casestudent is running at her top speed of 5.2m/s to catch a bus, which is stopped at the bus stop. For what distance does she have to run in that case |

## Determine the fundamental frequency of this pipeA certain pipe has resonant frequencies of 240 Hz, 400 Hz, and 560 Hz, with no other resonant frequencies between these values. What is the fundamental frequency of this pipe |

## What is the final speed of the crateA 51.0 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 235 N. What is the final speed of the crate after being pulled these 22.5 m |

## At what time did it stopAt t=0 a grinding wheel has an angular velocity of 24.20 rad/s. It has a constant angular acceleration of 24.2 rad/s^2 until a circuit breaker trips at t = 1.2 seconds. |

## What is the maximum height attained by the cannon ballA cannon ball is shot straight upward with a velocity of 77.50 m/s. What is the maximum height attained by the cannon ball |

## Determine the initial velocity of a silver bulletwhat is the initial velocity of a silver bullet if it completely melts when striking a werewolf? the initial temperature of the bullet is 300 |

## Determine how much power is savedEstimate how much power is saved if the voltage is stepped up from 240 V to 1200 V and then down again, rather than simply transmitting at 240 V |

## Find the volume flow rate of the gasA venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A2 = 0.0600 m2. Find the volume flow rate Q of the gas |

## Calculate the mass of air in the tankA cylindrical air tank has dimensions diameter = 0.2m and height 0.8m, Calculate the mass of air in the tank (kg) (have to use ideal gas law, molecular weight of air) |

## Find the time the projectile is in the airA projectile is shot on level ground with a horizontal velocity of 18 m/s and a vertical velocity of 41 m/s, Find the time the projectile is in the air. The acceleration due to gravity is 9.8 m/s2 |

## What is the magnetic field at the center of the coilA closely wound circular coil with a diameter of 4.00cm has 600 turns and carries a current of 0.500 A. What is the magnetic field at the center of the coil? |

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