Q1. Young's double-slit experiment is performed with 570 nm light and a distance of 2.00 m between the slits and the screen. The tenth interference minimum is observed 7.64 mm from the central maximum. Settle on the spacing of the slits.
Q2. A 15.4 kg block is dragged over a rough, horizontal surface by a constant force of 187 N acting at an angle of angle 26.6 above the horizontal. The block is displaced 9.41 m and the coefficient of kinetic friction is 0.14. 15.4 kg μ = 0.14 x 18^7 N 26.6. Find the work completed by the 187 N forces. The acceleration of gravity is 9.8 m/s2.