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!

KInetic Energy Basic Calculations

  1. Jan 15, 2013 #1
    1. The problem statement, all variables and given/known data

    6. A 2.5-kg book slides horizontally and falls from a shelf 3.0m above the floor. How much work does the force of gravity do on the book as it falls 3.0m?
    F. 1.2 J
    G. 7.5 J
    H. 24.5 J
    J. 73.5 J

    7. Which of the following is the minimum amount of work done by a hydraulic lift to raise a 150-kg aluminum block 2.0m vertically?
    A. 75 J
    B. 300 J
    C. 1470 J
    D. 2940 J

    8. The motion of roller coasters depends upon the conversion of potential and kinetic energy. a 100-kg car starts from rest at the top of a hill with a height of 50 m. Which of the following is this car's kinetic energy at the bottom of the hill?
    F. 150 J
    G. 5000 J
    H. 49,000 J
    J. 98,000 J

    9. A 0.25-g paint chip comes off a satellite orbiting Earth. The velocity of the paint chip is 7000 m/s. Which is the kinetic energy of the paint chip?
    A. 1750 J
    B. 6125 J
    C. 12,250 J
    D. 24,500 J

    10. An automobile was moving at 15 m/s and accelerated at 2 m/s^2 for 2 s. Which was its final speed?
    F. 17 M/S
    G. 25 M/S
    H. 27 M/S
    J. 35 M/S

    2. Relevant equations
    ke=1/2mv^2



    3. The attempt at a solution
    for 8 I'm getting G or H
    for 9 I'm getting A or B
    for 10 I'm getting J
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 15, 2013 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Pls post your working.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: KInetic Energy Basic Calculations
Loading...