1. A cylindrical copper rod of length 1.2 m and cross-sectional area 4.8 cm2 is insulated to prevent heat loss through its surface. The ends are maintained at a temperature difference of 100 Co by having one end in a water-ice mixture and the other in boiling water and steam.

a. Find the rate at which heat is transferred along the rod.

b. Find the rate at which ice melts at one end.

## Find out an electric potential difference va - vbAn alpha particle (m = 6.7 ´ 10-27 kg, q = +3.2 ´ 10-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out an electric potential difference V.. |

## What is the speed of the command module relative to earthA box is placed on a conveyor belt that moves with a constant speed of 1.05. The coefficient of kinetic friction between box and belt is 0.80. How much time does it take for the box to stop sliding relative to belt. |

## Calculate the work done and final tempratureA 4kg parcel of dry air initially at p=950mb and T=295K compresses isobarically to one third of its original volume, Calculate the final temperature and the work done |

## The magnitude of the angular momentum of the systemA father (m = 70 kg) and son (m = 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast will the father be moving. |

## How long will it take the wheel to make one-half revolutionwhat force is needed to pull a 150 pound sled along a horizontal surface? The coeficient of kinetic friction is 0.10 and the sled is pulled by a rope that makes the angle of 0 degree with the horizontal. There is no acceleration. |

## What is the work done on tennis ballA football player runs the pattern by the three displacement vectors, , and . The magnitudes of these vectors are A = 4.00 m, B = 18.0 m, and C = 16.0 m. Using the component method, find out the (1) magnitude and (2) direction of the resultant vec.. |

## Find the acceleration of the apple while it is in the grassAn apple drops from the tree and falls freely. The apple is originally at rest a height {H0} above the top of the grass of a thick lawn, which is made of blades of grass of height {h}. When apple enters the grass, it slows down at a constant rate .. |

## Calculate the difference that accumulatesAn accurate clock is kept in a laboratory located on the equator of the Earth, calculate the difference that accumulates between the laboratory clock and each of the two flying clocks upon one trip around the Earth |

## Find out the time of one full oscillation of blockA 238 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 32.5 cm.compute the gravitational potential energy at A relative to B. |

## What is the increase in temperature of the bulletMonochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected light is a maximum only for 472.9 and 696.0 in the visible spectrum. What is the minimum thickness of the film. |

## Calculate what mass of hydrogen the sun convert into heliumUse the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years. |

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