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Thread: nedd suloution of phy101...plzz help :(

  1. #1
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    18 nedd suloution of phy101...plzz help :(

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    Assignment 1: (Fall 2010)
    PHYSICS (PHY101)
    TOTAL MARKS: 20
    Due Date:28 /10/2010
    DON’T MISS THESE Important instructions:
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    Q # 1
    Consider a box that is placed on different surfaces. Marks = 10
    a) In which situation (s) is there no force acting on the box?
    b) In which situation (s) is there a static friction force acting on the box?
    c) In which situation (s) is there a kinetic friction force acting on the box?
    Various possible situations are as under:
    I. The box is at rest on a rough horizontal surface.
    II. The box is at rest on a rough tilted surface.
    III. The box is on the rough-surfaced flat bed of a truck- the truck is moving at a
    constant velocity on a straight, level road and the box remains in the same
    place in the middle of the truck bed.
    IV. The box is on the rough-surfaced flat bed of a truck- the truck is speeding up
    on a straight, level road, and box remains in the same place in the middle of
    the truck bed.
    V. The box is on the rough-surfaced flat bed of a truck- the truck is climbing a
    hill, and the box is sliding towards the back of the truck.
    Q # 2
    A spaceship is moving in the vacuum of outer space, far from any planet, when its engine
    dies. As a result, the spaceship slows down and stops. What does Newton‘s first law say
    about this event? Marks = 5
    Q # 3
    A traffic light of weight W hangs from two light cables; one on each side of the light.
    Each cable hangs at a 450 angle from the horizontal. What I the tension in each cable?
    Marks = 5

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  2. #2
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    Q # 1:Consider a box that is placed on different surfaces. Marks = 10

    a) In which situation (s) is there no force acting on the box?
    b) In which situation (s) is there a static friction force acting on the box?
    c) In which situation (s) is there a kinetic friction force acting on the box?

    Various possible situations are as under:

    I. The box is at rest on a rough horizontal surface.

    II. The box is at rest on a rough tilted surface.

    III. The box is on the rough-surfaced flat bed of a truck- the truck is moving at a constant velocity on a straight, level road and the box remains in the same place in the middle of the truck bed.


    IV. The box is on the rough-surfaced flat bed of a truck- the truck is speeding up on a straight, level road, and box remains in the same place in the middle of the truck bed.


    V. The box is on the rough-surfaced flat bed of a truck- the truck is climbing a hill, and the box is sliding towards the back of the truck.

    Q # 2 A spaceship is moving in the vacuum of outer space, far from any planet, when its engine dies. As a result, the spaceship slows down and stops. What does Newton‘s first law say about this event? Marks = 5

    Solution:-

    In this situation there are no forces acting on the spaceship, so according to Newton’s first law, it will not stop. It continues to move in a straight line with constant speed, some science fiction movies have made use of very accurate science; this was not one of them.





    Q # 3: A traffic light of weight W hangs from two light cables; one on each side of the light. Each cable hangs at a 450 angle from the horizontal. What I the tension in each cable? Marks = 5

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