Recent content by najisalem2009

Homework Statement A cosmic ray travels 60km through the Earth's atmosphere in 400μs, as mesured by experimenters on the ground. a. Calculate the relative velocity between the cosmic ray's intertial reference grame and the Earth's inertial reference frame. b. How long does...

Thanks a lot red belly. (6.68x10-27)-(6.64x10-27)= 4x10-29 E=4x10-29x(2.99x108)2 E=3.57x10-12

(6.68x10-27)4-2.656x10-26=-.1988x10-16 E=-.1988x10-16x(2.99x108)2 E=-1.77x10-9 No matter how i do it i can't seem to get the answer of 3.6x10-12

ive also tried working it out the way you said and it the answer still didnt come up to 3.6x10-12. Does anyone know what I am doing wrong?

3.6x10-12, was the answer given to me. I tried working it out using the mass of 4 protons - the mass of 4 He but the answer is still not correct. Mass Lost = (1.673x10-27 X4)-(4.002602x4) =-16.01amu -16.01amu x )6.64x10-27/1 amu) =1.063X10-25 kg...

Homework Statement In a nuclear fusion reaciton 4 protons fuse together. The final result is a helium nucleus and a release of energy. The net reaction is 4p→⁴He+ energy. The mass of a helium nucleus is 6.64×10-27kg. How much energy is released each decay? Homework Equations Mass lost...

oh ok thanks a lot guys for clearing that up for me

So i found the equation Its s= (v+u)/1+(vu/c²) s=(0.9c+0.9c)/1+(0.9c)(0.9c)/(2.98*10⁸)² i get s=.18c but the answer is -0.994c

anyone?

Homework Statement A laboratory experiment shoots an electron to the left at 0.9c. What is the electrons speed relative to a proton that is moving to the right at 0.9c? I have no idea how to attempt this problem i know the answer is -.0994c but I am not sure how to get this answer?

I have another similar problem except this time no time is given. Person A is standing at x=9.0 km. Lighting bolt 1 strikes at x=0 km and lighting bolt 2 strikes at x = 12.0 km. A second person (person B) is standing at x=3.0km. Person A experiences the both lighting bolts at the same time...

Thanks ideasrule and q11we both your posts helped me a lot.

Homework Statement You are standing at x=600m. Firecracker 1 explodes at x=0m. Firecracker 2 explodes at x=900m. The flashes from both explosions reach your eyes at t=3.0μs. a. Are the two events simultaneous. Why? b. at what time did each firecracker explode.? Homework...