Q1. Two boats start together and race across a 46 km-wide lake and back. Boat A goes across at 60 km/h and returns at 60 km/h. Boat B goes across at 20 km/h, and its crew, realizing how far behind it is getting, returns at 70 km/h. Turnaround times are negligible, and boat that completes the round-trip first wins.

Q2. A flight attendant pulls her 71 N flight bag a distance of 322 m along a level airport floor at a constant velocity. The force she exerts is 36 N at an angle of 53° above the horizontal.

## What lengths of ship three sides according to the observerWhat lengths of ship three sides according to the observer |

## Find out the linear speed of coinTwo carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 7.0 kg, and the other has total mass of 5.0 kg. If the 5.0 kg cart is moving at 3.0 m/s after the spring is allowed.. |

## What is the speed of plane over the groundAn airplane pilot wishes to fly due west. A wind of 88.0 km/h is blowing toward the south. What is the speed of plane over the ground in km/h. |

## Write down an equation for the bridge''s heightHow long is the bridge? Write down an equation for the bridge's height. And how far from the center of the bridge are two points if bridge's height at those points is 80 meters. |

## The coefficient of kinetic friction between block and floorA 3.57 kg block is drawn at constant speed 4.06 m along a horizontal floor by a rope exerting a 7.68 N force at angle of 15 degree above the horizontal. Work out the coefficient of kinetic friction between block and floor. |

## What is the entropy change of the gasAn electric field of 8.60 x 107 V/m is desired between two parallel plates, each of area 35.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate. |

## Find initial position before momentarily coming to restFor the Atwood's machine, suppose the masses have an initial speed of v = 0.22 m/s and that m2 is moving upward. How high does m2 rise above its initial position before momentarily coming to rest, given that m1 = 3.5 kg and m2 = 3.1 kg. |

## What is the speed of the air as it leaves the nozzleFind out the work completed by neoconservative forces in stopping plane. At the nozzle exit, diameter is 2.5 cm and the density is 1.29kg/m^3. What is the speed of the air as it leaves the nozzle. |

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