Recent content by Woopa

I am having difficulty understanding the information below. In the second line it states that F=0 as there is no external force on the system. However it later calculates acceleration of the rocket. How can Force=0 if there is acceleration? (This is the first time I have encountered the...

I am having trouble understanding this derivation and need some guidance. 1) I tried solving the algebra from the first equation to the second equation circled in red. Can someone please help with what algebra steps, I cannot solve to the circled solution. 2) What does Ee stand for? Is it...

Thanks for the clarification everyone!

Okay I think I've got it! So energy of alpha particle 2(1.0073x931.55)+2(1.0087x931.55)=3756MeV Total energy = 88x(1.0073x931.55)=138(1.0087x931.55)=212247Mev Ratio total energy:alpha particle = 212247/3756=56 So the alpha particle makes up 1/56th of the total energy. Why do we only think...

the relative energy would be the ratio of 4: 222= 0.018?

I can follow through all of this worked example until the final step 55/56x4.84= 4.75MeV Where does the 56 come from?

Where is my mistake?

Ah yes that make sense I can see now the numbers are actually for V, the way they've written out the equation has confused me. However I am still arriving at the final answer P=2P. I must be making a mistake in my algebra. I will post my working in a moment

Do you mean it is a typo/ error in the worked solution?

Question: Answer: In the third last line of working, I do not understand why the pressure variable is changing? Shouldn't pressure remain constant and only the Volume change?

The solution is : The pressure inside the solid is zero and outside it equals atmospheric pressure, 1.01 × 10^5 Pa. Thus, the force is given by: F =pA = 1.01 × 10^5 × (0.25)^2 = 6.3 × 10^3 N I do not understand why only the area of one cube is used in the solution, should it not be the area...

Excellent I've got it! Thank you!

Hi, The solution for this question is thermal energy lost= thermal energy gained 0.200x450x(300-T)=1.0x4200x(T-20) T=26 degrees celcius. However, I am struggling to grasp why (300-T) is used. I have always known a change in something to be final - initial. Therefore change in T= Final-...

It's just clicked! Thank you for the prompts I've got it

If I multiply by 2 and then sqrt I end up with VA=√ v^2-gh I'm just missing the 2gh