Let us assume that the winter consists of 150 days in which the outside temperature is 0C. This will give the typical number of "heating degree days" observed in a winter along the northeastern US seaboard. (The cumulative number of heating degree days is given daily by the National Weather Service and is used by oil companies to determine when they should fill the tanks of their customers.) Given that a gallon (3.4 ) of oil liberates when burned, how much oil will be needed to supply the heat lost by conduction from this house over a winter? Assume that the heating system is 75% efficient.

Kinetic energy of system conserved when two objects collide : Is kinetic energy of a system conserved when two objects collide and stick together? What about the momentum of the system? What kind of collision is this (elastic or inelastic )? |

A proton with an initial velocity : A proton with an initial velocity of (1.0x + 2.0y + 3.0z) x10^5 m/s enters a magnetic field of 0.50z T. Find the magnitude of the force on the proton. The mass of the proton is 1.67x10^-27 kg. The answer is 1.8x10^-14 N I think the equation you shoul.. |

Sliding on a rough horizontal surface : The mass m = 1.02 kg is sliding on a rough horizontal surface. A force F = 8.41 N is applied at an angle of 36.4 degrees. Compute the acceleration a (in m/s2) of the mass on the surface if the coefficient of kinetic friction is 0.112. Use g = 9.8 m/s.. |

Block to reach maximum amplitude after the collision : A block of mass 0.1 kg is attached to a spring of spring constant 11 N/m on a frictionless track. The block moves in simple harmonic motion with amplitude 0.13 m. While passing through the equilibrium point from left to right, the block is struck .. |

Typical number of heating degree days : Let us assume that the winter consists of 150 days in which the outside temperature is 0C. This will give the typical number of "heating degree days" observed in a winter along the northeastern US seaboard. |

Water with mass-what is the final temperature of the mixture : Water with a mass of 0.500 at 15.0 is mixed with 0.800 of water at 35.0. What is the final temperature of the mixture? Express your answer in degrees Celsius. Suppose that in an insulated container, 0.100 of water at 20.0 is mixed with 1.500 of ic.. |

Energy can be stored in capacitor with two parallel plates : How much energy can be stored in a capacitor with two parallel plates, each with an area of 64.0 cm2 and separated by a gap of 1.7 mm, filled with porcelain whose dielectric constant is 5.9, and holding equal and opposite charges of magnitude 370. ?C |

Roller-coaster car may be represented by block of mass : A roller-coaster car may be represented by a block of mass 50.0kg . The car is released from rest at a height h = 57.0m above the ground and slides along a frictionless track. The car encounters a loop of radius R = 19.0m at ground level, as shown.. |

Find the radius of the star rigel and the bright blue star : Find the radius of the star Rigel, the bright blue star in the constellation Orion that radiates energy at a rate of 2.7*10^32W and has a surface temperature of 11,000K . Assume that the star is spherical. Use 5.67*10^-8W/m^2*K^4 for the Stefan-Bo.. |

## Find the rate at which heat is transferred along the rodA cylindrical copper rod of length 1.2 m and cross-sectional area 4.8 cm2 is insulated to prevent heat loss through its surface, Find the rate at which heat is transferred along the rod |

## Find the required tension for a wave in the stringTransverse waves travel at 23.3 m/s on a string that is under a tension of 7.00 N. What tension is required for a wave speed of 33.3 m/s in the string |

## Find the temperature at the aluminum-steel interfaceIn an aluminum pot, 0.15 kg of water at 100 degrees c boils away in four minutes. find the temperature at the aluminum-steel interface |

## A ball is thrown at an angle of 30 degrees with an initiala ball is thrown at an angle of 30 degrees with an initial velocity of 20 ms at an elevation of 10 m. how long will it |

## Evaluate the new rotational speed of the diskA uniform disk with a mass of 840 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz, What is the new rotational speed of the disk |

## Determine the moment of inertia for three children weighingDetermine the moment of inertia for three children weighing 64.0 lb, 43.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft. |

## Calculate the total angle through which the wheel has turnedThe flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.43 rad/s2. It accelerates for 31.5 s, then maintains a constant angular velocity |

## How much time is required for the car to pass the truckThe driver of a car wishes to pass a truck that is travelling at a constant speed of 20 meters per second. Initially, the car is also travelling at 20 meters per second and its front bumper is 24 meters behind truck's rear bumper. |

## Q1 charge of uniform density 80 ncm3 is distributedq1. charge of uniform density 80 ncm3 is distributed throughout a hollow cylinder region formed by two coaxial |

## How various kilograms of water at 25 degrees celsiusTwo cars a and b are travelling in the equal direction with velocities A and B(A>B). While the car a is at a distance behind car b, the drive of car a applies break producing uniform retardation r, there will b no collision while. |

## What is the equilibrium temperature of the contentsWhat is the result of mixing 80g of ice at -20 degrees Celsius, into a 200g of water at 20 degrees Celsius? |

## What fraction of the length is aluminumA wire is made by attaching two segments together, end to end. One segment is made of aluminum and the other is steel. What fraction of the length is aluminum |

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