Recent content by Hannah1

The only things that I can think of are that W = .5 * m * v2 might be the wrong formula to use... or that m/s might be the wrong unit to use. Other than that, I have no idea!

Thank you so much everyone for helping me! :smile: The teacher doesn't grade the method we use because we submit everything online. She gives us 3 chances to complete it so we can better our grade. I tried again with the homework earlier today, but still got the answer wrong. :frown...

I added "Joules" to the end of the answer and submitted the homework again, but I still got the answer wrong. :frown: Here are the steps I took to get my answer: I Googled "198 MeV to joules," and Google's built-in calculator gave me "198 megaelectron volts = 3.17230939 × 10-11 joules"...

It turns out that the correct answer for #3 is "Uranium." You don't have to add the number at the end.

There must be another answer though because other people got the question correct. :confused:

It should be an easy problem to figure out, but I can't find out how to do it! :( I feel stupid.

Determining the atomic number, mass number, and chemical name during beta decay! Homework Statement The image below shows the element Thorium with the atomic number listed above and a mass number of 233. This element undergoes two successive beta decays. The resulting nucleus will have an...

Calculate the speed of a proton given its kinetic energy! Homework Statement Find the speed of a proton (mass = 1.67E-27 kg), if its kinetic energy is 145eV. Write your answer correct to three significant figures. Homework Equations W=.5*m*v^2 Proton Mass = 1.67E-27 kg I tried using...

Converting binding energy of an element to joules! [SIZE="4"]The binding energy of Mg-24 is 198MeV. What is this value in Joules? Write your answer correct to three significant figures. MeV = megaelectron volt 1 megaelectron volt = 1.60217646 × 10-13 joules 198 megaelectron volts =...

What am I doing wrong? Please help. o:)

Thank you! :smile:

Help me? :cry:

So, according to Galilean addition, the answer would be: -78 + -58 = -136 AKA, the person in the other car is going 136 mph relative to me. Correct??

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??

1 J in SI base units is equal to 1 kg·m2/s2. The answer was, in fact, B. kg. :smile: