Arigid wire is put into the shape of a square with side length l. the square has a mass m and carries a current i. the square lies on a horizontal surface(x-y plane) and there is a uniform magnetic field b that is in the +x direction. what is the minimum value of the magnetic field so that one edge of the square will lift off the surface

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

Explain vector addition, triangle method and parallelogram method

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference