Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Jan 31st 2009, 11:14 AM   #1
Junior Member
 
Join Date: Jan 2009
Posts: 3
[SOLVED] Max value of Y-coordinate

I am so new to physics, and it's just so confusing to figure out which numbers go in what equation and such. Here's a problem I'm struggling with:

A cart is propelled over an xy plane with acceleration components ax = 6.6 m/s2 and ay = -1.6 m/s2. Its initial velocity has components v0x = 7.4 m/s and v0y = 11.0 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest y coordinate?

EDIT: I solved that problem, but here's another one:



A certain airplane has a speed of 80.25m/s and is diving at an angle of θ = 27.0 below the horizontal when the pilot releases a radar decoy (Fig. 4-37). The horizontal distance between the release point and the point where the decoy strikes the ground is d = 747 m. (a) How long is the decoy in the air? (b) How high was the release point?

Last edited by craig22; Jan 31st 2009 at 03:07 PM.
craig22 is offline   Reply With Quote
Old Feb 1st 2009, 10:25 AM   #2
Senior Member
 
Join Date: Dec 2008
Location: Las Cruces NM
Posts: 256
The general equation for the position of a body under constant acceleration has certain constants. These are the acceleration, the initial position and the initial velocity. Did you try writing the equations for the x coordinate of the decoy position and the y coordinate of the decoy position? Defining t = 0 to be the time of release and t1 = the unknown time of impact, you can write some equations for the situation at those times. These equations will involve the unknown quantities.

Your question doesn't make it clear whether you have trouble with the physics (writing the equations) or the math of solving simultaneous equations.
tashirosgt is offline   Reply With Quote
Old Feb 4th 2009, 02:32 PM   #3
Junior Member
 
Join Date: Jan 2009
Posts: 3
I've already solved the problem. Thanks anyway!
craig22 is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Tags
max, solved, ycoordinate



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Physical defect of Einstein transformation of coordinate system Liuxinhua Special and General Relativity 15 Oct 20th 2016 07:31 PM
Hilbert space norm of vector invariant in different coordinate systems roger Quantum Physics 2 Jan 26th 2015 07:09 PM
fluid shear stress in Polar coordinate tracker890 Thermodynamics and Fluid Mechanics 2 Feb 25th 2014 06:17 PM
sum of the angles in coordinate system mars shaw Special and General Relativity 3 Sep 29th 2009 01:06 AM


Facebook Twitter Google+ RSS Feed