Masses mm and 3m3m approach at the same speed vv and collide head-on. Find the final speed of mass 3m3m, while mass mm rebounds at speed 2v2v. Express your answer in terms of the variables mmm and vvv.

Photons with the highest energy have the longest period

The vector a? is 3.50 cm long and is directed into this page. vector b? points from the lower-right corner of this page to the upper-left corner of this page and has the components bx=-19.5 cm , by=25 cm. in the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page, and +z-axis out of the page, find the x-component of the vector product a? ×b? , measured in cm2.

Based on the diagram of the electric field lines around the two spherical charges, what are the signs of the left and right charge respectively?