A box of winter jackets of mass 109 kg is droped from a stationary helicopter at an altitude of 135 m. It lands the ground with a speed
of 10.0 m/s. During its fall, how much work
in Joule is done on
the box by air resistance (write magnitude only)?​

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c