A Thermopane window of area 6.8 m2 is constructed of two layers of glass, each 5.4mm thick and separated by an air space of 2 mm. If the inside is at 12?C and the outside is at ?36?C, how much heat is lost through the window? The thermal conductivity of glass is 0.8 W/m · ? C and of air 0.0234 W/m · ? C. Answer in units of kW.

Calculate the temperature at which a tung- sten filament : Calculate the temperature at which a tung- sten filament that has an emissivity of 0.25 and a surface area of 6.6×10?5 m2 will radiate energy at the rate of 51Win a roomwhere the temperature is 26?C. The Stefan-Boltzmann constant is 5.6696 × 10?8 W/m.. |

What is the current in the diameter section : A 3.00- length of copper wire at 20 has a 1.20--long section with diameter 1.8 and a 1.80--long section with diameter 0.90 . There is a current of 2.5 in the 1.8 -diameter section. What is the current in the 0.90 -diameter section? What is the magnit.. |

Silver is the best heat conductor of all metals : A pipe 0.026 m in diameter and 0.22 m long can transfer 3476 J of heat per second with a temperature difference across the ends of 7?C. Compare this performance with the heat transfer of a solid silver bar of the same di- mensions by finding the rati.. |

Find the student''s final angular velocity : A student sits on a swivel seat. Initially the student is at rest, holding a spinning bicycle wheel that has an angular velocity of 10.2 rad/s (see figure below). The student turns the spinning wheel upside down, reversing the direction of its angula.. |

How much heat is lost through the window : A Thermopane window of area 6.8 m2 is constructed of two layers of glass, each 5.4mm thick and separated by an air space of 2 mm. If the inside is at 12?C and the outside is at ?36?C, how much heat is lost through the window? The thermal conductivity.. |

Sound emerging from door spreads uniformly in all directions : A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the music is 37 dB at a distance of 5.99 m from the door. At what distance is the music just barely audible to a person with a .. |

How much sound power does the jet aircraft emit : The decibel level of the noise from a jet aircraft is 130 dB when measured 16.8 m from the aircraft. How much sound power does the jet aircraft emit? How much sound power would strike the eardrum of an airport worker 16.8 m from the aircraft? Assu.. |

Produce sound intensity equal to that of normal conversation : A typical decibel level for a buzzing mosquito is 40 dB and normal conversation is approximately 50 dB. How many buzzing mosquitoes will produce a sound intensity equal to that of normal conversation? |

Planets have so far been detected beyond our solar system : Over 500 planets have so far been detected beyond our solar system. This is accomplished by looking for the effect the planet has on the star. The star is not truly stationary; instead, it and its planets orbit around the center of mass of the sys.. |

## Find the angular speed when the child moves to the perimetera 250 kg merry-go-round is a solid disc with a radius of 1m when a 40 kg child sits at the center the angular speed is 6 rev/s |

## What is the weight of the stagingAn explosion breaks an object into two pieces, one of which has 1.80 times the mass of the other. If 10000 J were released in explosion, how much kinetic energy did each piece acquire. |

## Compute the speed of the air-track glider after gun is firedA light spring-gun projectile launcher is mounted on an 0.593 kg air track glider. compute the speed of the air-track glider after the gun is fired |

## Calculate the potential drop across one of the resistorsA circuit consists of two 150.?k? resistors in series with an ideal 12.0?V battery. Calculate the potential drop across one of the resistors |

## Designed to measure the partition coefficientAn experiment is designed to measure the partition coefficient, K, associated with the transfer of a pharmaceutical product through a polymer material. The partition coefficient is defined as the ratio of the densities of the species of interest (.. |

## Express force that the wall exerts on the left end of beamA 1210-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. |

## Compute the time constant of the circuitIt takes 2.30ms for the current in an LR circuit to increase from zero to 0.71 its maximum value, Determine the time constant of the circuit |

## How much kinetic energy is contained in this gasA tank holds 182 moles of argon gas (atomic mass = 6.633521 × 10-26 kg) at a pressure of 101300 Pa and a temperature of 308 K. How much kinetic energy is contained in this gas |

## Evaluate the temperature of the gasA gas of 1.50×10^20 atoms or molecules has 0.900 J of thermal energy. evaluate the temperature of the gas |

## Find the peak value of the potential difference across coilA 2.90 H coil with a resistance of 6.41×101 ? is in series with a 1.14×103 ? resistor. What is the peak value of the potential difference across the coil |

## Find the speed of the soccer ballThe momentum of a soccer player is 100kg-m/sec and he hits a soccer ball with a mass 0.1 kg, find the speed(velocity) of the soccer ball |

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