Ask Experts Questions for FREE Help !
Ask
    nat89's Avatar
    nat89 Posts: 1, Reputation: 1
    New Member
     
    #1

    Nov 3, 2007, 09:14 PM
    projectile motion problems
    I need help answering these word problems... I don't get it at all. I don't know how to draw the picture and label it with info that is given.
    I have to use the following equations to solve for it...
    variable with subscore of x or y is the direction. X for horizontal and y for vertical...
    X:
    vx = vox + axt

    vx2 = vox2 + 2ax (x-xo)

    x = xo + vox t + 1/2 ax t2

    Y:

    vy = voy + ayt

    vy2 = voy2 + 2ay (y-yo)

    y = yo + voy t + 1/2 ay t2

    the x, y, ox, and oy are subscripts except for one in parenthesis but o is always subscript for initial and the 2 is power.

    1. a tiger jumps horizontally off a 3 meter tall rock lands on 2 meters from the base of the rock.how much time did the tiger spend in the air?

    2. what was the initial velocity of the tiger in problem 1?

    3. an arrow is shot horizontally with an initial velocity of 120 m/s. how much time does the arrow spend in the air before hitting the ground?

    4 how far did the arrow travel in problem 3?

    I just want to know how to draw the picture and what is given for x or y?? Or possibly solve it, but if it takes too much time don't have to... thanks if you help or even if you don't :)
    sorry if I do something wrong I'm knida new to this... :)
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
     
    #2

    Nov 6, 2007, 05:45 AM
    What you have to understand is:

    1. Horizontal velocity remains unchanged - acceleration is zero
    2. Vertical acceleration is downward, with value equal to g (gravity)
    3. Think of the verticle and horizontal motion in isolation from each other. This will
    help you figure out the solutions.

    4. For example, in the first case find the expression for time to fall from the height of 3 meters, and this should equal the time to travel 2 meters horizontally.

    5. When something starts horizontally, the verticle component of initial velocity is obviously zero.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
     
    #3

    Nov 6, 2007, 12:15 PM
    Another Hint:

    Ask a friend to throw a ball horizontally from some height, while you observe the path of the ball.

    This will help you visualise the curve.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Projectile motion [ 1 Answers ]

An Olympic basketball player shoots towards a basket that is 5.54 m horizontally from her and 3.05 m above the floor. The ball leaves her hand 1.52 m above the floor at an angle of 63.0o above the horizontal. What initial speed should she give the ball so that it reaches the basket and hopefully...

Projectile motion [ 2 Answers ]

In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes? How does the downward component of the motion of a projectile compare with the motion of free fall??

Projectile motion [ 1 Answers ]

A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 29.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. a) Find the maximum...

Projectile motion- physics [ 1 Answers ]

Alysen sets sail into the west upon graduating from her 7 year high school program. She ends up stranded on an island in the South Pacific with only coconuts to eat. Even the monekys know that the coconuts must hit the ground with a velocity of 80m/s to break open. Alysen climbs a 10 m high tree...


View more questions Search