1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: How much time does the blood take to reach its final velocity?

  1. Sep 30, 2007 #1
    the left ventricle of the heart accleartes blood from rest toi a velocity of +26 cm/s.
    A)if the displacement of the blood during the acceleration is +20 cm, determine its accleatrion in (cm/s)
    b) How much time does the blood take to reach its final velcoity?

    Kindly plz provide steps by steps so i can learn better!!

  2. jcsd
  3. Sep 30, 2007 #2
    You are given final and initial velocities and displacement, but not time.

    The equation for accelerated motion when time is unknown is
    A) Vf^2 = Vi^2 + 2*a*s where Vf is final velocity and Vi is initial velocity. Solve for a.

    Now that you know a, use your definition of acceleration:
    B) a = (Vi + Vf) / t solve for t.

    You need to know these formulas! They come up again and again in physics.
  4. Sep 30, 2007 #3
    What he said, in laTex:

    [tex] V_{final}^{2} = U_{initial}^{2} + 2as [/tex]

    V = Final Velocity
    U = Initial Velocity
    a = Acceleration (in ms if U and V and s are in meters.)
    s = Displacement
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook