Results 1 to 2 of 2

Thread: need help please (physics)

  1. July 26th 2007, 02:17 PM #1
    twistedmexican
    twistedmexican is offline
    Newbie
    Joined
    Jun 2007
    Posts
    10

    need help please (physics)

    In college homecoming competition, 16 students lift sports car while holding the car off the ground, each student exerts an upward force of 400 N. (a) what is the mass of the car in kilograms? (b) what is its weight in pounds?
    Follow Math Help Forum on Facebook and Google+
  2. July 26th 2007, 04:21 PM #2
    topsquark
    topsquark is offline
    Moderator
    topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,079
    Thanks
    152
    Awards
    1
    MHF Donor
    Quote Originally Posted by twistedmexican View Post
    In college homecoming competition, 16 students lift sports car while holding the car off the ground, each student exerts an upward force of 400 N. (a) what is the mass of the car in kilograms? (b) what is its weight in pounds?
    a) Each of the 16 students is exerting an upward force on the car and (I presume) the car is stationary and off the ground. So the students are supplying the only upward force, which is counteracting the weight of the car. Thus
    w = 16F = 16 \cdot (400~N) = 6400~N
    (where w is the weight of the car.)

    So the mass of the car is
    m = \frac{w}{g} = \frac{6400~N}{9.8~m/s^2} = 653.061~kg

    b) 1 lb = 4.45 N, so
    \frac{6400~N}{1} \cdot \frac{1~lb}{4.45~N} = 1439.75~lb

    -Dan
    Follow Math Help Forum on Facebook and Google+
« physics | Mixture Problem - Preparing eye drops »

Similar Math Help Forum Discussions

  1. Got a physics question or interested in physics?
    Posted in the Math Topics Forum
    Replies: 11
    Last Post: November 4th 2012, 09:23 AM
  2. physics help...
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: February 17th 2009, 06:20 AM
  3. how do solve quantum physics or physics equations
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: March 26th 2008, 04:33 AM
  4. Physics...
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: March 5th 2008, 07:31 PM
  5. physics, acceleration, physics problem
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: September 29th 2007, 03:50 AM

Search Tags


/mathhelpforum @mathhelpforum