How Much Energy Can We Obtain from 211g of Peanuts?

[Hannah1]

Homework Statement

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

Homework Equations

E = mc²
c = 300,000,000 m/sec

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??

 

[tiny-tim]

Hi Hannah1!

E = (0.211)(300,000,000)²
E = 7.21899e+18

You seem to have entered 80.211 into your calculator.

 

[Hannah1]

Hi Hannah1! You seem to have entered 80.211 into your calculator.

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??

 

[tiny-tim]

(just got up :zzz:)

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??

he he

yes

 

[Hannah1]

(just got up :zzz:)


he he

yes

Thank you!