Ask Me Help Desk

Ask Me Help Desk (https://www.askmehelpdesk.com/forum.php)
-   Physics (https://www.askmehelpdesk.com/forumdisplay.php?f=258)
-   -   Phyics Tutor (https://www.askmehelpdesk.com/showthread.php?t=411221)

  • Oct 30, 2009, 12:48 PM
    decent
    Phyics Tutor
    Hello,

    I'm not good in Physics, but I really want to learn. I'm just to slow to understand... So my question is, can anyone teach me for free about Physics?

    Thank you,
    decent
  • Oct 31, 2009, 12:37 AM
    Unknown008

    Oh, please! Post your questions, post your work like I told you earlier!

    Quote:

    Originally Posted by decent
    1. A 1600-kg car is moving at 20 m/s northward. A cement delivery truck with a mass of 2500 kg moving at 35 m/s southward collides head-on with the car. If they move together after collision, what is their common velocity?

    2. A 25-g ball moving southward at 30 m/s collides with a 10-g ball moving along the same line with a velocity of 15 m/s southward. After collision, the 25-g ball attains a velocity of 22 m/s southward. What is the velocity of the 10-g ball?

    Use the law of conservation of momentum;

    m_1 being the mass of the first body
    m_2 the mass of the second body
    u_1 the initial velocity of body 1
    u_2 the initial velocity of body 2
    v_1 the final velocity of body 1
    v_2 the final velocity of body 2

    m_1u_1 is the initial momentum of the first body
    m_2U_2 is the initial momentum of the second body
    m_1v_1 is the final momentum of the first body
    m_2v_2 is the final momentum of the second body

    m_1u_1 + m_2u_2 is the sum of initial momenta
    m_1v_1 + m_2v_2 is the sum of final momenta

    I cannot spoon-feed you all the time! It's time to work! Post your answers.

  • All times are GMT -7. The time now is 07:50 PM.