# Posts by Youssef

Total # Posts: 7

physics
. A long string carries a wave; a 6-m segment of the string contains four complete wavelengths and has a mass of 180 g. The string vibrates sinusoidal with a frequency of 50 Hz and a peak-to-valley displacement of 15 cm. (The “peak-to- valley” distance is the ...

Physics
Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.6 million electron volts, a charge of +2e, and a mass of about four AMU (one Atomic Mass Unit is 1.66 x 10-27 kg. Gold has atomic number ...

Physics
Three charges are located at the corners of a rectangle as follows: Charge A: lower left corner, -3.0 Î¼C Charge B: upper left corner, -6.1 Î¼C Charge C: upper right corner, +2.7 Î¼C The distance between A and B is 0.16 m and between B ...

Physics
As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and the cloud to be the other plate. The altitude of the cloud is 600m and its area is 6.5 km2. How much charge can the cloud hold before the dielectric strength of air is ...

Physics
A positive and a negative charge are separated a distance r. What can we say about the electric potential energy of this two-particle system, according to our normal definitions of potential energy and work? Select the best answer. a. It is positive b. It is negative c. It is ...

math
i want a mathematic equation to apply on the number 579494 and get as a result the number 573 ,they told me that its simple but i can't figure it out(if somebody find many ways please give it all ).thanks

math
how to get 537 out of 579494 ?