physics

Hi! I have a problem for physics homework and I though I knew how to solve it but apparently it is wrong, please help!

'Two cars, one of mass 1000 kg, and the second of mass 2400 kg, are moving at right angles to each other when they collide and stick together. The initial velocity of the first car is 11 m/s in the positive x direction and that of the second car is 19 m/s in the positive y direction.
What is the magnitude of the velocity of the wreckage of the two crs immediately after the collision? Answer in units of m/s"

I did (1000*11)+(2400*19)=3400*v3
is that correct?

  1. 👍 0
  2. 👎 0
  3. 👁 60
asked by Ty
  1. You forgot to include the directions of the speeds. The correct equation is:

    1000*11 x-hat +2400*19 y-hat=3400*v3

    v3 = 110/43 x-hat +24*19/43 y-hat

    The magnitude of v3 is thus:

    sqrt[(110/43 )^2 + (24*19/43 )^2]

    1. 👍 0
    2. 👎 0
  2. I wonder if Count Iblis transposed 34 to 43? Check my thinking.

    1. 👍 0
    2. 👎 0
  3. so does 10.908 sound right?

    Also, ( just so I know for future problem) what is x-hat and y-hat (we just started 2d collisions so I am sorry if this is very obvious)

    1. 👍 0
    2. 👎 0
    posted by Ty
  4. xhat and y hat are unit direction vectors, of magnitude 1. Thus 12xhat is 12 in the x direction.

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    34. Two students (say A, and B) are challenged to solve a problem in statistics. Suppose that the probability that A will solve the problem is 40%, the probability that B will solve the problem is 55%, and the probability that A

    asked by meri on June 30, 2015
  2. Physics

    A physics student stands on the edge of a cliff 2x meters. He throws his physics homework straight up in the air. Derive an expression to calculate the time taken by the homework to come back to the student.

    asked by Tyler on September 30, 2017
  3. Calculus

    Hi there I am having some troubles trying to do my calculus homework and I really need help trying to do this problem from my homework: Set up the problem and do not solve: The mass of the solid bounded by the surfaces 2x^2 +

    asked by shylo on December 3, 2009
  4. Physics

    Please help!!! Physics test!? I have a physics test tomorrow on projectile motion, and I don't feel ready for it. I'm having trouble in the class and I need to ace this test. The problem is I get confused when I get a problem. I

    asked by Mike on October 9, 2012
  5. English

    1. I knew how he did his homework. 2. I knew how he had done his homework. ----------------------------- What is the difference between the two sentences?

    asked by rfvv on November 1, 2016
  6. 3rd grade

    Good evening ~ I have 2 questions. Kelsey was assigned math homework. He was given 8 word problems to solve. He estimated that it would take him 5 mins. to solve each problem (THAT WOULD TAKE 40 MINS. FOR KELSEY TO COMPLETE HIS

    asked by Ross on December 4, 2008
  7. Math

    Please solve these word problem .jeremy finished 3/5 of his homework .what percentage of his homework did he finish ?

    asked by Tabassum sultana on February 15, 2019
  8. Algebra

    How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is

    asked by Becca on October 3, 2007
  9. Algenra

    How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is

    asked by Becca on October 3, 2007
  10. algebra 2

    i need help with my algebra 2 homework, the section is called using matrices to represent data. here is one of the problems: -1/2A+(B-A) A=[7 3 -1 5] [-2 8 0 -4] and B= [6 0 11 -3] [-5 2 -8 9] i don't know how to do this problem

    asked by brittany on March 17, 2009

More Similar Questions