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!

Energy obtained from peanuts

  1. Oct 10, 2012 #1
    1. The problem statement, all variables and given/known data
    How much energy can we obtain from 211g of peanuts. (Remember c = speed of light = 3 E 8 m/s) Remember to write your answer to two decimal places and for example 4.56x10^8 must be written as 4.56E8


    2. Relevant equations
    E = mc2
    c = 300,000,000 m/sec

    3. The attempt at a solution
    211 g = 0.211 kg
    E = (0.211)(300,000,000)2
    E = 7.21899e+18

    Energy = 7.22E18 Joules

    Am I correct??
     
    Last edited: Oct 10, 2012
  2. jcsd
  3. Oct 10, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Hannah1! :smile:
    You seem to have entered 80.211 into your calculator. :wink:
     
  4. Oct 10, 2012 #3
    You're right! My bad. I tried again and this is what I got:
    E = (0.211)(300,000,000)2
    E = 1.899e+16

    Therefore, Energy = 1.90E16 Joules.

    Am I correct now??
     
  5. Oct 11, 2012 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    (just got up :zzz:)
    he he :biggrin:

    yes :smile:
     
  6. Oct 11, 2012 #5
    Thank you! :smile:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Energy obtained from peanuts
Loading...