Homework Statement
A positron has the same mass as an electron but is of opposite sign (9e-31 kg).
What is the sum of the energies of the two photons which are produced when the positron and the electron annihilate?
Assume the speed of the positron is .93c (c is the speed of light) with an...
That makes sense.
So instead of trying to figure out the wire's mass we would find the mass of the weight added to the end (though in this case it's given).
So it's simply (9.81m/s*109kg)/(pi*(7.5E-4)^2) = 6.0509E8 = stress
6.0509E8/5.0357E-3 = 1.2016E11 - this seems like a large...
Hey alphysicist,
First of all, thank you for the help.
Ok, I redid the problem making
mass = density*length^3 = 4.54E3 kg/m^3 * 2.8^3 = 9.966208E4
stress=F{t}/A = 9.81*mass / pi*(7.5E-4)^2 = 5.5325E11
strain=.0141m/2.8m = 5.0357E-3
stress/strain = 5.53256E11/5.0357E-3 = 1.098665E14...
Homework Statement
A hanging wire made of an alloy of titanium with diameter 0.15 cm is initially 2.8 m long. When a 109 kg mass is hung from it, the wire stretches an amount 1.41 cm. A mole of titanium has a mass of 48 grams, and its density is 4.54 g/cm^3.
Based on these experimental...